fix: patch dependency advisories on the current release

Keep Next on the patched 15.5 line instead of the Next 16 Dependabot bump, and move OpenTelemetry and gRPC to the versions that close the open Go alerts.

.env.example

@@ -23,6 +23,8 @@ FRONTEND_ORIGINS=https://localhost,https://127.0.0.1
 # Keep false unless you intentionally want fail-open rate limits / captcha.
 DEV_MODE=false
 SEED_CURRICULUM=false
+# One registration per client IP. Keep false behind NAT / shared egress (default).
+REGISTRATION_ENFORCE_IP=false
 # METRICS_TOKEN=
 # TRUSTED_PROXY_CIDRS=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,127.0.0.0/8,::1/128
 

.env.prod.example

@@ -23,6 +23,8 @@ FRONTEND_ORIGINS=https://app.example.com
 
 DEV_MODE=false
 SEED_CURRICULUM=false
+# Keep false behind NAT until the edge forwards real client IPs.
+REGISTRATION_ENFORCE_IP=false
 METRICS_TOKEN=replace-with-metrics-scrape-token
 # TRUSTED_PROXY_CIDRS=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
 

backend/go.mod

@@ -12,10 +12,10 @@ require (
 	github.com/jackc/pgx/v5 v5.11.0
 	github.com/redis/go-redis/v9 v9.22.0
 	github.com/rs/cors v1.11.1
-	go.opentelemetry.io/otel v1.35.0
+	go.opentelemetry.io/otel v1.45.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.35.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.45.0
-	go.opentelemetry.io/otel/sdk v1.35.0
+	go.opentelemetry.io/otel/sdk v1.45.0
-	go.opentelemetry.io/otel/trace v1.35.0
+	go.opentelemetry.io/otel/trace v1.45.0
 	golang.org/x/crypto v0.57.0
 )
 
@@ -34,26 +34,26 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.43.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.51.1 // indirect
 	github.com/aws/smithy-go v1.28.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/logr v1.4.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.1 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.29.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
-	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.35.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.45.0 // indirect
-	go.opentelemetry.io/otel/metric v1.35.0 // indirect
+	go.opentelemetry.io/otel/metric v1.45.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.5.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.11.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	golang.org/x/net v0.58.0 // indirect
 	golang.org/x/sync v0.23.0 // indirect
 	golang.org/x/sys v0.48.0 // indirect
 	golang.org/x/text v0.42.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20250218202821-56aae31c358a // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260803160001-6ac0973c030d // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250218202821-56aae31c358a // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260803160001-6ac0973c030d // indirect
-	google.golang.org/grpc v1.71.0 // indirect
+	google.golang.org/grpc v1.83.2 // indirect
-	google.golang.org/protobuf v1.36.5 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 )

backend/go.sum

@@ -38,16 +38,16 @@ github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
 github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
 github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
 github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
-github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
+github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
-github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
-github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.4 h1:tG4xh9yMsRCAiodLVTxyrkzSZ9+o0L1Kg/+cPVcbP/8=
-github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/logr v1.4.4/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
 github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
 github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
@@ -60,8 +60,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.1 h1:e9Rjr40Z98/clHv5Yg79Is0NtosR5LXRvdr7o/6NwbA=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.29.0 h1:5VipnvEpbqr2gA2VbM+nYVbkIF28c5ZQfqCBQ5g2xfk=
-github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.1/go.mod h1:tIxuGz/9mpox++sgp9fJjHO0+q1X9/UOWd798aAm22M=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.29.0/go.mod h1:Hyl3n6Twe1hvtd9XUXDec4pTvgMSEixRuQKPTMH2bNs=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
 github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
@@ -85,24 +85,24 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/zeebo/xxh3 v1.1.0 h1:s7DLGDK45Dyfg7++yxI0khrfwq9661w9EN78eP/UZVs=
 github.com/zeebo/xxh3 v1.1.0/go.mod h1:IisAie1LELR4xhVinxWS5+zf1lA4p0MW4T+w+W07F5s=
-go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
-go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
-go.opentelemetry.io/otel v1.35.0 h1:xKWKPxrxB6OtMCbmMY021CqC45J+3Onta9MqjhnusiQ=
+go.opentelemetry.io/otel v1.45.0 h1:pdrWmLHofpubmArBv1LgFSv1Z0Ie/ppdZzu+kUN5EeU=
-go.opentelemetry.io/otel v1.35.0/go.mod h1:UEqy8Zp11hpkUrL73gSlELM0DupHoiq72dR+Zqel/+Y=
+go.opentelemetry.io/otel v1.45.0/go.mod h1:XZxIqPapzEYnhNSScF5DIqXhm/rYi0FzCe2XddAwZfQ=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.35.0 h1:1fTNlAIJZGWLP5FVu0fikVry1IsiUnXjf7QFvoNN3Xw=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.45.0 h1:QRefszxJmfPdjXUUm3j6iDzY03mTPXMjqErFqQ67vUg=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.35.0/go.mod h1:zjPK58DtkqQFn+YUMbx0M2XV3QgKU0gS9LeGohREyK4=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.45.0/go.mod h1:Tiz03lTBVBrm7eWZBOidzEaYaJa8tjwGUGv6d8mlTyk=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.35.0 h1:xJ2qHD0C1BeYVTLLR9sX12+Qb95kfeD/byKj6Ky1pXg=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.45.0 h1:QBajQ2SrwQijzHyZbQlPsuIzpl/ll8DY6wPWsajeGcI=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.35.0/go.mod h1:u5BF1xyjstDowA1R5QAO9JHzqK+ublenEW/dyqTjBVk=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.45.0/go.mod h1:08ZQLjrPLQ6R4kAXvuOvODEer5Yh4CoFvll5qB2BCI8=
-go.opentelemetry.io/otel/metric v1.35.0 h1:0znxYu2SNyuMSQT4Y9WDWej0VpcsxkuklLa4/siN90M=
+go.opentelemetry.io/otel/metric v1.45.0 h1:7Eg1uH7CJ5cXv9is6tnBe1FI6rj1nwUdbFypRm3br/M=
-go.opentelemetry.io/otel/metric v1.35.0/go.mod h1:nKVFgxBZ2fReX6IlyW28MgZojkoAkJGaE8CpgeAU3oE=
+go.opentelemetry.io/otel/metric v1.45.0/go.mod h1:HAPbm1nd3p1PmFH7v2dR+6BjXxw+Lq4a2+pndMAm08s=
-go.opentelemetry.io/otel/sdk v1.35.0 h1:iPctf8iprVySXSKJffSS79eOjl9pvxV9ZqOWT0QejKY=
+go.opentelemetry.io/otel/sdk v1.45.0 h1:4VVSMgQ83dUgW2aoX5f6JgLvHwIvzcuLnF9lUdCSpCw=
-go.opentelemetry.io/otel/sdk v1.35.0/go.mod h1:+ga1bZliga3DxJ3CQGg3updiaAJoNECOgJREo9KHGQg=
+go.opentelemetry.io/otel/sdk v1.45.0/go.mod h1:Sr40LgXV7DsKMMJMKOhUWOgMWTfAaqvm2kF0g7ilwuA=
-go.opentelemetry.io/otel/sdk/metric v1.34.0 h1:5CeK9ujjbFVL5c1PhLuStg1wxA7vQv7ce1EK0Gyvahk=
+go.opentelemetry.io/otel/sdk/metric v1.45.0 h1:oVFszMfyj1Am6s24Vtc7wBb8BKLcwepJjNEYILuiE3o=
-go.opentelemetry.io/otel/sdk/metric v1.34.0/go.mod h1:jQ/r8Ze28zRKoNRdkjCZxfs6YvBTG1+YIqyFVFYec5w=
+go.opentelemetry.io/otel/sdk/metric v1.45.0/go.mod h1:vUWUxDZvu1WVRj8JA8S0AdhsPrZoDpA2DdZauIh4mDA=
-go.opentelemetry.io/otel/trace v1.35.0 h1:dPpEfJu1sDIqruz7BHFG3c7528f6ddfSWfFDVt/xgMs=
+go.opentelemetry.io/otel/trace v1.45.0 h1:l/mP6Uv7oNO7/TblbhpbgMidxhq1uO/rPsikOyVhxag=
-go.opentelemetry.io/otel/trace v1.35.0/go.mod h1:WUk7DtFp1Aw2MkvqGdwiXYDZZNvA/1J8o6xRXLrIkyc=
+go.opentelemetry.io/otel/trace v1.45.0/go.mod h1:qoJJA2xNMnxRrdISU/kLtfUH2wNeQbiv+jhs/CxI8bc=
-go.opentelemetry.io/proto/otlp v1.5.0 h1:xJvq7gMzB31/d406fB8U5CBdyQGw4P399D1aQWU/3i4=
+go.opentelemetry.io/proto/otlp v1.11.0 h1:5rrYs0Ykyj50sdU/JU0x8etU+LubXWb+gED6TbEdMIk=
-go.opentelemetry.io/proto/otlp v1.5.0/go.mod h1:keN8WnHxOy8PG0rQZjJJ5A2ebUoafqWp0eVQ4yIXvJ4=
+go.opentelemetry.io/proto/otlp v1.11.0/go.mod h1:SmVizdCOAm3XBtG1g1NnOdhW6jtddT72hLMhv8VwA8E=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
 go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
@@ -117,14 +117,16 @@ golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
 golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
 golang.org/x/text v0.42.0 h1:JbOZXgfeCPU9gacVtYliJqOhD+zhrEqK4LfdpmlUZqI=
 golang.org/x/text v0.42.0/go.mod h1:ojzP1Z+2QtioaF8DTtO8K5q7JWVVYwZKenzujK0Zd0E=
-google.golang.org/genproto/googleapis/api v0.0.0-20250218202821-56aae31c358a h1:nwKuGPlUAt+aR+pcrkfFRrTU1BVrSmYyYMxYbUIVHr0=
+gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
-google.golang.org/genproto/googleapis/api v0.0.0-20250218202821-56aae31c358a/go.mod h1:3kWAYMk1I75K4vykHtKt2ycnOgpA6974V7bREqbsenU=
+gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250218202821-56aae31c358a h1:51aaUVRocpvUOSQKM6Q7VuoaktNIaMCLuhZB6DKksq4=
+google.golang.org/genproto/googleapis/api v0.0.0-20260803160001-6ac0973c030d h1:FarXi840EJWSHYTN3ERkADbPWjl307+FGrA22KAVjjc=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250218202821-56aae31c358a/go.mod h1:uRxBH1mhmO8PGhU89cMcHaXKZqO+OfakD8QQO0oYwlQ=
+google.golang.org/genproto/googleapis/api v0.0.0-20260803160001-6ac0973c030d/go.mod h1:K/+WGbmBY7aNW1HDw1fJnKYo10i0DkAX6pows00dLig=
-google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260803160001-6ac0973c030d h1:IL4hdHzcUv2l/gcg98/Rj3FbtE6axwqslOW8SW0C+S0=
-google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260803160001-6ac0973c030d/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
+google.golang.org/grpc v1.83.2 h1:EManeRomTObA0BU7I8vXgg/78uE5MJ9M8B39EX2WscU=
-google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/grpc v1.83.2/go.mod h1:YPI1hK3kDked6iHvgX3tR0y+nX/qpMFKhPgFsokw1S8=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

backend/internal/api/admin.go

@@ -22,6 +22,20 @@ func (s *Server) handleAdminStats(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{"stats": stats})
 }
 
+func (s *Server) handleAdminGetUser(w http.ResponseWriter, r *http.Request) {
+	id := routeID(r, "id")
+	if id <= 0 {
+		writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
+		return
+	}
+	u, err := s.store.GetUserByID(r.Context(), id)
+	if err != nil {
+		writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"user": u})
+}
+
 func (s *Server) handleAdminListUsers(w http.ResponseWriter, r *http.Request) {
 	query := r.URL.Query().Get("q")
 	role := r.URL.Query().Get("role")
@@ -389,27 +403,17 @@ func (s *Server) handleAdminResetPassword(w http.ResponseWriter, r *http.Request
 		writeErr(w, http.StatusForbidden, "دسترسی کافی ندارید")
 		return
 	}
-	target, err := s.store.GetUserByID(r.Context(), id)
+	if _, err := s.store.GetUserByID(r.Context(), id); err != nil {
-	if err != nil {
 		writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
 		return
 	}
 	var req struct {
-		SecurityAnswer string `json:"securityAnswer"`
+		NewPassword string `json:"newPassword"`
-		NewPassword    string `json:"newPassword"`
 	}
 	if err := bodyJSON(r, &req); err != nil {
 		writeErr(w, http.StatusBadRequest, "دادهٔ ارسالی نامعتبر است")
 		return
 	}
-	if target.SecurityAnswerHash == "" {
-		writeErr(w, http.StatusBadRequest, "برای این کاربر سوال امنیتی تعریف نشده است")
-		return
-	}
-	if !s.auth.CheckPassword(target.SecurityAnswerHash, strings.ToLower(strings.TrimSpace(req.SecurityAnswer))) {
-		writeErr(w, http.StatusForbidden, "جواب سوال امنیتی نادرست است")
-		return
-	}
 	if msg := validatePasswordOnly(req.NewPassword); msg != "" {
 		writeErr(w, http.StatusBadRequest, msg)
 		return

backend/internal/api/auth.go

@@ -306,6 +306,7 @@ func (s *Server) handlePutAvatar(w http.ResponseWriter, r *http.Request) {
 		writeErr(w, http.StatusInternalServerError, "به‌روزرسانی آواتار ممکن نشد")
 		return
 	}
+	s.signUserMedia(user)
 	writeJSON(w, http.StatusOK, map[string]any{"user": user})
 }
 

backend/internal/api/captcha.go

@@ -22,7 +22,7 @@ import (
 )
 
 const (
-	captchaTTL             = 5 * time.Minute
+	captchaTTL             = 2 * time.Minute
 	captchaKeyPrefix       = "pargar:captcha:"
 	captchaRateLimit int64 = 60
 	captchaCharset         = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
@@ -260,6 +260,7 @@ func (s *Server) handleCaptcha(w http.ResponseWriter, r *http.Request) {
 			resp := map[string]any{
 				"challengeId": "dev",
 				"imageBase64": img,
+				"expiresIn":   int(captchaTTL.Seconds()),
 			}
 			if s.cfg.CaptchaExposeAnswer {
 				resp["answer"] = "A2B3"
@@ -297,6 +298,7 @@ func (s *Server) handleCaptcha(w http.ResponseWriter, r *http.Request) {
 	resp := map[string]any{
 		"challengeId": id,
 		"imageBase64": img,
+		"expiresIn":   int(captchaTTL.Seconds()),
 	}
 	// Never expose plaintext answers in production. Local tests may opt in via
 	// CAPTCHA_EXPOSE_ANSWER=true combined with DEV_MODE=true.

backend/internal/api/captcha_test.go

@@ -30,6 +30,10 @@ func TestCaptchaImageChallenge(t *testing.T) {
 	if id == "" || img == "" || answer == "" {
 		t.Fatalf("captcha missing fields: %v", body)
 	}
+	exp, ok := body["expiresIn"].(float64)
+	if !ok || exp < 60 || exp > 180 {
+		t.Fatalf("expiresIn should be a short window: %v", body["expiresIn"])
+	}
 	if _, ok := body["question"]; ok {
 		t.Fatalf("legacy question field should be gone: %v", body)
 	}

backend/internal/api/certificate.go

@@ -228,12 +228,22 @@ func (s *Server) handleRequestPhysicalCertificate(w http.ResponseWriter, r *http
 
 func (s *Server) handleAdminListPhysicalOrders(w http.ResponseWriter, r *http.Request) {
 	status := r.URL.Query().Get("status")
-	orders, err := s.store.ListPhysicalOrders(r.Context(), status)
+	p := parsePageParams(r)
+	orders, total, err := s.store.ListPhysicalOrders(r.Context(), status, p.PageSize, p.Offset)
 	if err != nil {
 		writeErr(w, http.StatusInternalServerError, "بارگذاری سفارش‌ها ممکن نشد")
 		return
 	}
-	writeJSON(w, http.StatusOK, map[string]any{"orders": orders, "physical": s.physicalSettings(r.Context())})
+	if orders == nil {
+		orders = []models.CertificatePhysicalOrder{}
+	}
+	writeJSON(w, http.StatusOK, map[string]any{
+		"orders":   orders,
+		"total":    total,
+		"page":     p.Page,
+		"pageSize": p.PageSize,
+		"physical": s.physicalSettings(r.Context()),
+	})
 }
 
 func (s *Server) handleAdminUpdatePhysicalOrder(w http.ResponseWriter, r *http.Request) {

backend/internal/api/chat.go

@@ -37,6 +37,7 @@ func (s *Server) handleListMentors(w http.ResponseWriter, r *http.Request) {
 		if actor.Role == models.RoleStudent && m.Role != models.RoleMentor && m.Role != models.RoleAdmin {
 			continue
 		}
+		s.signUserMedia(&m)
 		safe = append(safe, map[string]any{
 			"id": m.ID, "name": m.Name, "email": m.Email, "role": m.Role,
 			"avatarVariant": m.AvatarVariant, "avatarPalette": m.AvatarPalette, "avatarPhoto": m.AvatarPhoto,
@@ -111,10 +112,16 @@ func (s *Server) handleConversations(w http.ResponseWriter, r *http.Request) {
 				unread++
 			}
 		}
+		photo := p.AvatarPhoto
+		if photo != "" {
+			tmp := &models.User{ID: p.ID, AvatarPhoto: photo}
+			s.signUserMedia(tmp)
+			photo = tmp.AvatarPhoto
+		}
 		conv := conversation{
 			Partner: map[string]any{
 				"id": p.ID, "name": p.Name, "email": p.Email, "role": p.Role,
-				"avatarVariant": p.AvatarVariant, "avatarPalette": p.AvatarPalette, "avatarPhoto": p.AvatarPhoto,
+				"avatarVariant": p.AvatarVariant, "avatarPalette": p.AvatarPalette, "avatarPhoto": photo,
 				"online": s.hub.Online(p.ID),
 			},
 			UnreadCount: unread,
@@ -137,6 +144,7 @@ func (s *Server) handleChatMessages(w http.ResponseWriter, r *http.Request) {
 		writeErr(w, http.StatusForbidden, "شما اجازهٔ گفتگو با این کاربر را ندارید")
 		return
 	}
+	_ = s.markIncomingChatRead(r.Context(), u, partner)
 
 	if raw := r.URL.Query().Get("around"); raw != "" {
 		aroundID, err := strconv.ParseInt(raw, 10, 64)
@@ -156,7 +164,6 @@ func (s *Server) handleChatMessages(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		_ = s.store.FillReactions(r.Context(), u.ID, msgs)
-		_ = s.store.MarkChatRead(r.Context(), u.ID, partner)
 		s.resignChatMessages(msgs)
 		pinned, _ := s.store.ListPinnedChatMessages(r.Context(), u.ID, partner)
 		if pinned == nil {
@@ -197,7 +204,6 @@ func (s *Server) handleChatMessages(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 	_ = s.store.FillReactions(r.Context(), u.ID, msgs)
-	_ = s.store.MarkChatRead(r.Context(), u.ID, partner)
 	s.resignChatMessages(msgs)
 	pinned, _ := s.store.ListPinnedChatMessages(r.Context(), u.ID, partner)
 	if pinned == nil {
@@ -337,6 +343,73 @@ func (s *Server) handleChatReact(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "emoji": emoji, "reactions": reactions})
 }
 
+func (s *Server) handleChatEdit(w http.ResponseWriter, r *http.Request) {
+	u := currentUser(r)
+	partner := routeID(r, "partner")
+	if !s.canChatWith(r.Context(), u, partner) {
+		writeErr(w, http.StatusForbidden, "شما اجازهٔ گفتگو با این کاربر را ندارید")
+		return
+	}
+	msgID := routeID(r, "id")
+	var req struct {
+		Body       string             `json:"body"`
+		Attachment *models.Attachment `json:"attachment,omitempty"`
+	}
+	if err := bodyJSON(r, &req); err != nil {
+		writeErr(w, http.StatusBadRequest, "دادهٔ ارسالی نامعتبر است")
+		return
+	}
+	req.Body = strings.TrimSpace(req.Body)
+	if len(req.Body) > 4000 {
+		writeErr(w, http.StatusBadRequest, "پیام باید بین ۱ تا ۴۰۰۰ نویسه باشد")
+		return
+	}
+
+	var (
+		msg *models.ChatMessage
+		err error
+	)
+	if req.Attachment != nil {
+		att := req.Attachment
+		att.Type = strings.ToLower(strings.TrimSpace(att.Type))
+		if att.Type != "image" && att.Type != "video" && att.Type != "audio" {
+			writeErr(w, http.StatusBadRequest, "فقط عکس، ویدیو یا صدا را می‌توان جایگزین کرد")
+			return
+		}
+		key := mediaKeyFromURL(att.URL)
+		if key == "" || !mediaKeyOwnedByUser(key, u.ID) {
+			writeErr(w, http.StatusBadRequest, "پیوست متعلق به شما نیست")
+			return
+		}
+		if q := strings.Index(att.URL, "?"); q >= 0 {
+			att.URL = att.URL[:q]
+		}
+		if att.Name == "" {
+			att.Name = "file"
+		}
+		msg, err = s.store.ReplaceChatAttachment(r.Context(), u.ID, partner, msgID, u.Role, req.Body, att.Type, att.URL, att.Name, att.Size)
+	} else {
+		if req.Body == "" {
+			writeErr(w, http.StatusBadRequest, "پیام باید بین ۱ تا ۴۰۰۰ نویسه باشد")
+			return
+		}
+		msg, err = s.store.EditChatMessage(r.Context(), u.ID, partner, msgID, u.Role, req.Body)
+	}
+	if errors.Is(err, store.ErrNotFound) {
+		writeErr(w, http.StatusNotFound, "پیام پیدا نشد")
+		return
+	}
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, "ویرایش پیام ممکن نشد")
+		return
+	}
+	s.resignChatMessage(msg)
+	event := map[string]any{"type": "chat_edit", "item": msg, "from": u.ID}
+	s.hub.Push(u.ID, event)
+	s.hub.Push(partner, event)
+	writeJSON(w, http.StatusOK, map[string]any{"message": msg})
+}
+
 func (s *Server) handleChatDelete(w http.ResponseWriter, r *http.Request) {
 	u := currentUser(r)
 	partner := routeID(r, "partner")
@@ -473,13 +546,25 @@ func (s *Server) handleChatRead(w http.ResponseWriter, r *http.Request) {
 		writeErr(w, http.StatusForbidden, "شما اجازهٔ گفتگو با این کاربر را ندارید")
 		return
 	}
-	if err := s.store.MarkChatRead(r.Context(), u.ID, partner); err != nil {
+	if err := s.markIncomingChatRead(r.Context(), u, partner); err != nil {
 		writeErr(w, http.StatusInternalServerError, "به‌روزرسانی وضعیت خوانده‌شدن ممکن نشد")
 		return
 	}
 	writeJSON(w, http.StatusOK, map[string]any{"ok": true})
 }
 
+func (s *Server) markIncomingChatRead(ctx context.Context, reader *models.User, partnerID int64) error {
+	if reader == nil {
+		return nil
+	}
+	n, err := s.store.MarkChatRead(ctx, reader.ID, partnerID, reader.Role)
+	if err != nil || n == 0 {
+		return err
+	}
+	s.hub.Push(partnerID, map[string]any{"type": "chat_read", "from": reader.ID})
+	return nil
+}
+
 func (s *Server) canChatWith(ctx context.Context, actor *models.User, partnerID int64) bool {
 	if actor == nil || partnerID <= 0 || actor.ID == partnerID {
 		return false

backend/internal/api/chat_export.go

@@ -57,6 +57,7 @@ type chatExportMessage struct {
 	ReplyTo    *int64                `json:"replyTo,omitempty"`
 	Pinned     bool                  `json:"pinned"`
 	PinnedAt   *time.Time            `json:"pinnedAt,omitempty"`
+	EditedAt   *time.Time            `json:"editedAt,omitempty"`
 	Attachment *chatExportAttachment `json:"attachment,omitempty"`
 }
 
@@ -183,6 +184,7 @@ func (s *Server) buildProjectChatExport(r *http.Request) (*chatExportPayload, []
 					ReplyTo:    m.ReplyTo,
 					Pinned:     m.PinnedAt != nil,
 					PinnedAt:   m.PinnedAt,
+					EditedAt:   m.EditedAt,
 				}
 				if m.Attachment != nil {
 					att := &chatExportAttachment{

backend/internal/api/identity_test.go

@@ -45,7 +45,7 @@ func TestUniquePhone(t *testing.T) {
 	}
 }
 
-func TestAdminResetPasswordRequiresSecurityAnswer(t *testing.T) {
+func TestAdminResetPassword(t *testing.T) {
 	e := setup(t)
 	admin := login(t, e, bootstrapAdminEmail)
 	code, body := e.do(t, "POST", "/api/admin/users", admin, map[string]any{
@@ -59,14 +59,14 @@ func TestAdminResetPasswordRequiresSecurityAnswer(t *testing.T) {
 	uid := int64(body["user"].(map[string]any)["id"].(float64))
 
 	code, _ = e.do(t, "POST", "/api/admin/users/"+itoa(uid)+"/reset-password", admin, map[string]any{
-		"securityAnswer": "اشتباه", "newPassword": "newpass123",
+		"newPassword": "short",
 	})
-	if code != http.StatusForbidden {
+	if code != http.StatusBadRequest {
-		t.Fatalf("wrong answer should 403, got %d", code)
+		t.Fatalf("short password: %d", code)
 	}
 
 	code, body = e.do(t, "POST", "/api/admin/users/"+itoa(uid)+"/reset-password", admin, map[string]any{
-		"securityAnswer": "تهران", "newPassword": "newpass123",
+		"newPassword": "newpass123",
 	})
 	if code != http.StatusOK {
 		t.Fatalf("reset: %d %v", code, body)

backend/internal/api/invites.go

@@ -130,16 +130,8 @@ func (s *Server) handleRegisterInvite(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	ip := clientAddress(r)
+	ip, ok := s.registrationClientIP(w, r)
-	if ip == "" || ip == "unknown" {
+	if !ok {
-		writeErr(w, http.StatusBadRequest, "آدرس شبکه شناسایی نشد")
-		return
-	}
-	if taken, err := s.store.HasRegistrationIP(r.Context(), ip); err != nil {
-		writeErr(w, http.StatusInternalServerError, "بررسی محدودیت ثبت‌نام ممکن نشد")
-		return
-	} else if taken {
-		writeErr(w, http.StatusConflict, "از این شبکه قبلاً ثبت‌نام انجام شده است")
 		return
 	}
 
@@ -292,8 +284,15 @@ func (s *Server) handleAdminCreateInvite(w http.ResponseWriter, r *http.Request)
 
 func (s *Server) handleAdminListInvites(w http.ResponseWriter, r *http.Request) {
 	q := strings.TrimSpace(r.URL.Query().Get("q"))
+	status := strings.TrimSpace(r.URL.Query().Get("status"))
+	switch models.InviteStatus(status) {
+	case "", models.InviteActive, models.InvitePaused, models.InviteRevoked, models.InviteExhausted:
+	default:
+		writeErr(w, http.StatusBadRequest, "وضعیت نامعتبر است")
+		return
+	}
 	p := parsePageParams(r)
-	invites, total, err := s.store.ListRegistrationInvites(r.Context(), q, p.PageSize, p.Offset)
+	invites, total, err := s.store.ListRegistrationInvites(r.Context(), q, status, p.PageSize, p.Offset)
 	if err != nil {
 		writeErr(w, http.StatusInternalServerError, "بارگذاری لینک‌های عضویت ممکن نشد")
 		return

backend/internal/api/invites_test.go

@@ -130,6 +130,7 @@ func TestInviteRevoke(t *testing.T) {
 }
 
 func TestInviteDuplicatePhoneAndIP(t *testing.T) {
+	t.Setenv("REGISTRATION_ENFORCE_IP", "true")
 	e := setup(t)
 	inv := createInvite(t, e, 5, "", nil)
 	token := inv["token"].(string)

backend/internal/api/leaderboard.go

@@ -63,6 +63,7 @@ func (s *Server) handleWeeklyLeaderboard(w http.ResponseWriter, r *http.Request)
 		if err != nil {
 			continue
 		}
+		s.signUserMedia(usr)
 		entries = append(entries, lbEntry{
 			UserID: sc.userID, Name: usr.Name, Email: usr.Email, XP: sc.xp, Rank: i + 1,
 			AvatarVariant: usr.AvatarVariant, AvatarPalette: usr.AvatarPalette, AvatarPhoto: usr.AvatarPhoto,

backend/internal/api/learning.go

@@ -1,9 +1,11 @@
 package api
 
 import (
+	"errors"
 	"net/http"
 
 	"pargar/backend/internal/observability"
+	"pargar/backend/internal/store"
 )
 
 func (s *Server) handleLearningOverview(w http.ResponseWriter, r *http.Request) {
@@ -21,12 +23,25 @@ func (s *Server) handleLearningStudents(w http.ResponseWriter, r *http.Request)
 	ctx, span := observability.StartSpan(r.Context(), "admin.learning.students")
 	defer span.End()
 	q := r.URL.Query().Get("q")
-	rows, err := s.store.ListStudentLearning(ctx, q)
+	filter := r.URL.Query().Get("filter")
+	switch filter {
+	case "active", "locked":
+	default:
+		filter = ""
+	}
+	sort := r.URL.Query().Get("sort")
+	switch sort {
+	case "progress", "streak", "activity":
+	default:
+		sort = "xp"
+	}
+	p := parsePageParams(r)
+	rows, total, err := s.store.ListStudentLearning(ctx, q, filter, sort, p.PageSize, p.Offset)
 	if err != nil {
 		writeErr(w, http.StatusInternalServerError, "بارگذاری فهرست هنرجویان ممکن نشد")
 		return
 	}
-	writeJSON(w, http.StatusOK, map[string]any{"students": rows})
+	writePage(w, rows, total, p)
 }
 
 func (s *Server) handleUserLearning(w http.ResponseWriter, r *http.Request) {
@@ -34,9 +49,13 @@ func (s *Server) handleUserLearning(w http.ResponseWriter, r *http.Request) {
 	defer span.End()
 	id := routeID(r, "id")
 	detail, err := s.store.UserLearningDetail(ctx, id)
-	if err != nil {
+	if errors.Is(err, store.ErrNotFound) {
 		writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
 		return
 	}
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, "بارگذاری جزئیات یادگیری ممکن نشد")
+		return
+	}
 	writeJSON(w, http.StatusOK, map[string]any{"learning": detail})
 }

backend/internal/api/media_sign.go

@@ -13,12 +13,28 @@ import (
 	"pargar/backend/internal/models"
 )
 
+// mediaSignWindow keeps one signature for a stretch of time. The same object
+// then keeps the same URL, so clients do not reload a photo that did not change.
+const mediaSignWindow = 15 * time.Minute
+
+func stableMediaExpiry(now time.Time, ttl, window time.Duration) int64 {
+	if window <= 0 {
+		window = mediaSignWindow
+	}
+	if ttl < window {
+		ttl = window
+	}
+	w := int64(window.Seconds())
+	slot := now.Unix() / w
+	return (slot+1)*w + int64(ttl.Seconds())
+}
+
 func (s *Server) signMediaURL(key string) string {
 	key = strings.TrimPrefix(strings.TrimSpace(key), "/")
 	if key == "" {
 		return ""
 	}
-	exp := time.Now().Add(s.cfg.MediaURLTTL).Unix()
+	exp := stableMediaExpiry(time.Now(), s.cfg.MediaURLTTL, mediaSignWindow)
 	sig := mediaHMAC(s.cfg.JWTSecret, key, exp)
 	return fmt.Sprintf("%s/media/%s?exp=%d&sig=%s",
 		s.cfg.PublicURL,

backend/internal/api/media_sign_test.go

@@ -7,6 +7,24 @@ import (
 	"pargar/backend/internal/config"
 )
 
+func TestStableMediaExpiryHoldsInsideWindow(t *testing.T) {
+	start := time.Unix((1_700_000_000/900)*900, 0)
+	ttl := time.Hour
+	window := 15 * time.Minute
+	a := stableMediaExpiry(start, ttl, window)
+	b := stableMediaExpiry(start.Add(14*time.Minute), ttl, window)
+	if a != b {
+		t.Fatalf("same window should keep one expiry: %d vs %d", a, b)
+	}
+	c := stableMediaExpiry(start.Add(15*time.Minute), ttl, window)
+	if c == a {
+		t.Fatal("next window should mint a new expiry")
+	}
+	if c < a {
+		t.Fatal("expiry should move forward")
+	}
+}
+
 func TestMediaSignatureRoundTrip(t *testing.T) {
 	s := &Server{cfg: &config.Config{JWTSecret: "test-secret-at-least-32-chars-long!!", PublicURL: "http://localhost", MediaURLTTL: time.Hour}}
 	url := s.signMediaURL("videos/lesson-1.mp4")

backend/internal/api/profile.go

@@ -0,0 +1,42 @@
+package api
+
+import (
+	"errors"
+	"net/http"
+
+	"pargar/backend/internal/store"
+)
+
+func (s *Server) handlePublicProfile(w http.ResponseWriter, r *http.Request) {
+	id := routeID(r, "id")
+	if id <= 0 {
+		writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
+		return
+	}
+	u, err := s.store.GetUserByID(r.Context(), id)
+	if err != nil {
+		if errors.Is(err, store.ErrNotFound) {
+			writeErr(w, http.StatusNotFound, "کاربر پیدا نشد")
+			return
+		}
+		writeErr(w, http.StatusInternalServerError, "بارگذاری پروفایل ممکن نشد")
+		return
+	}
+	s.signUserMedia(u)
+	writeJSON(w, http.StatusOK, map[string]any{
+		"user": map[string]any{
+			"id":            u.ID,
+			"name":          u.Name,
+			"username":      u.Username,
+			"role":          u.Role,
+			"xp":            u.XP,
+			"hearts":        u.Hearts,
+			"streakCurrent": u.StreakCurrent,
+			"streakLongest": u.StreakLongest,
+			"avatarVariant": u.AvatarVariant,
+			"avatarPalette": u.AvatarPalette,
+			"avatarPhoto":   u.AvatarPhoto,
+			"isLocked":      u.IsLocked,
+		},
+	})
+}

backend/internal/api/recovery.go

@@ -5,7 +5,7 @@ import (
 )
 
 // Public self-service password recovery is disabled for students.
-// Staff reset passwords from the admin panel (requires the account security answer).
+// Staff set a new password from the admin profile. Public recovery stays off.
 
 func (s *Server) handleRecoveryChallenge(w http.ResponseWriter, r *http.Request) {
 	writeErr(w, http.StatusNotFound, "بازیابی رمز عمومی غیرفعال است")

backend/internal/api/register.go

@@ -27,6 +27,29 @@ func (s *Server) registrationRequireWhitelist(r *http.Request) bool {
 	return s.settingTruthy(r, "registration_require_whitelist", true)
 }
 
+// registrationClientIP returns the IP to bind to a registration when enforcement is on.
+// When REGISTRATION_ENFORCE_IP is false (default), returns "" so NAT / shared egress is ignored.
+func (s *Server) registrationClientIP(w http.ResponseWriter, r *http.Request) (string, bool) {
+	if s.cfg == nil || !s.cfg.RegistrationEnforceIP {
+		return "", true
+	}
+	ip := clientAddress(r)
+	if ip == "" || ip == "unknown" {
+		writeErr(w, http.StatusBadRequest, "آدرس شبکه شناسایی نشد")
+		return "", false
+	}
+	taken, err := s.store.HasRegistrationIP(r.Context(), ip)
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, "بررسی محدودیت ثبت‌نام ممکن نشد")
+		return "", false
+	}
+	if taken {
+		writeErr(w, http.StatusConflict, "از این شبکه قبلاً ثبت‌نام انجام شده است")
+		return "", false
+	}
+	return ip, true
+}
+
 func (s *Server) handleRegisterStatus(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{
 		"enabled":          s.registrationEnabled(r),
@@ -83,16 +106,8 @@ func (s *Server) handleRegister(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	ip := clientAddress(r)
+	ip, ok := s.registrationClientIP(w, r)
-	if ip == "" || ip == "unknown" {
+	if !ok {
-		writeErr(w, http.StatusBadRequest, "آدرس شبکه شناسایی نشد")
-		return
-	}
-	if taken, err := s.store.HasRegistrationIP(r.Context(), ip); err != nil {
-		writeErr(w, http.StatusInternalServerError, "بررسی محدودیت ثبت‌نام ممکن نشد")
-		return
-	} else if taken {
-		writeErr(w, http.StatusConflict, "از این شبکه قبلاً ثبت‌نام انجام شده است")
 		return
 	}
 

backend/internal/api/register_test.go

@@ -261,6 +261,7 @@ func TestRegisterDuplicatePhone(t *testing.T) {
 }
 
 func TestRegisterSameIPRejected(t *testing.T) {
+	t.Setenv("REGISTRATION_ENFORCE_IP", "true")
 	e := setup(t)
 	enableRegistration(t, e)
 	whitelistPhones(t, e, "09121110007", "09121110008")
@@ -278,7 +279,27 @@ func TestRegisterSameIPRejected(t *testing.T) {
 	}
 }
 
+func TestRegisterSameIPAllowedWhenEnforcementOff(t *testing.T) {
+	t.Setenv("REGISTRATION_ENFORCE_IP", "false")
+	e := setup(t)
+	enableRegistration(t, e)
+	whitelistPhones(t, e, "09121110007", "09121110008")
+
+	headers := map[string]string{"X-Forwarded-For": "203.0.113.40"}
+	code, body := e.doHeaders(t, "POST", "/api/auth/register", "", headers,
+		registerBody(t, e, "09121110007", "reg-ipoff1@test.dev", "regipoff1"))
+	if code != http.StatusCreated {
+		t.Fatalf("first: %d %v", code, body)
+	}
+	code, body = e.doHeaders(t, "POST", "/api/auth/register", "", headers,
+		registerBody(t, e, "09121110008", "reg-ipoff2@test.dev", "regipoff2"))
+	if code != http.StatusCreated {
+		t.Fatalf("same IP must be allowed when REGISTRATION_ENFORCE_IP=false: %d %v", code, body)
+	}
+}
+
 func TestRegisterUsesForwardedIP(t *testing.T) {
+	t.Setenv("REGISTRATION_ENFORCE_IP", "true")
 	e := setup(t)
 	enableRegistration(t, e)
 	whitelistPhones(t, e, "09121110009", "09121110010", "09121110011")

backend/internal/api/router.go

@@ -56,7 +56,9 @@ func newRouter(s *Server) http.Handler {
 	mux.HandleFunc("GET /api/chats/conversations", s.requireAuth(s.handleConversations))
 	mux.HandleFunc("GET /api/chats/{partner}/messages", s.requireAuth(s.handleChatMessages))
 	mux.HandleFunc("POST /api/chats/{partner}/messages", s.requireAuth(s.handleChatSend))
+	mux.HandleFunc("PUT /api/chats/{partner}/messages/{id}", s.requireAuth(s.handleChatEdit))
 	mux.HandleFunc("DELETE /api/chats/{partner}/messages/{id}", s.requireAuth(s.handleChatDelete))
+	mux.HandleFunc("GET /api/users/{id}", s.requireAuth(s.handlePublicProfile))
 	mux.HandleFunc("POST /api/chats/{partner}/messages/{id}/reaction", s.requireAuth(s.handleChatReact))
 	mux.HandleFunc("POST /api/chats/{partner}/messages/{id}/pin", s.requireAuth(s.handleChatPin))
 	mux.HandleFunc("POST /api/chats/upload", s.requireAuth(s.perUserRateLimit(uploadRateLimit, "upload", s.handleChatUpload)))
@@ -89,6 +91,7 @@ func newRouter(s *Server) http.Handler {
 	mux.HandleFunc("GET /api/admin/users/{id}/learning", staff(s.handleUserLearning))
 	// Account administration is admin-only; mentors may unlock locked students only.
 	mux.HandleFunc("GET /api/admin/users", admin(s.handleAdminListUsers))
+	mux.HandleFunc("GET /api/admin/users/{id}", admin(s.handleAdminGetUser))
 	mux.HandleFunc("POST /api/admin/users", admin(s.handleAdminCreateUser))
 	mux.HandleFunc("POST /api/admin/users/{id}/lock", admin(s.handleAdminLockUser))
 	mux.HandleFunc("POST /api/admin/users/{id}/unlock", staff(s.handleAdminUnlockUser))

backend/internal/api/surfaces_test.go

@@ -0,0 +1,330 @@
+package api_test
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestChatEditOwnMessage(t *testing.T) {
+	e := setup(t)
+	student, studentID := register(t, e, "Chat Editor", "chat-editor@test.dev")
+	admin := login(t, e, bootstrapAdminEmail)
+	code, me := e.do(t, "GET", "/api/auth/me", admin, nil)
+	if code != 200 {
+		t.Fatalf("me: %d %v", code, me)
+	}
+	adminID := int64(me["user"].(map[string]any)["id"].(float64))
+
+	code, body := e.do(t, "POST", "/api/chats/"+itoa(adminID)+"/messages", student, map[string]any{"body": "سلام"})
+	if code != 201 {
+		t.Fatalf("send: %d %v", code, body)
+	}
+	msg := body["message"].(map[string]any)
+	msgID := int64(msg["id"].(float64))
+
+	code, body = e.do(t, "PUT", "/api/chats/"+itoa(adminID)+"/messages/"+itoa(msgID), student, map[string]any{"body": "سلام ویرایش"})
+	if code != 200 {
+		t.Fatalf("edit: %d %v", code, body)
+	}
+	edited := body["message"].(map[string]any)
+	if edited["body"] != "سلام ویرایش" || edited["editedAt"] == nil {
+		t.Fatalf("expected edited body, got %v", edited)
+	}
+
+	code, _ = e.do(t, "PUT", "/api/chats/"+itoa(studentID)+"/messages/"+itoa(msgID), admin, map[string]any{"body": "نه"})
+	if code != 404 {
+		t.Fatalf("partner edit should be rejected: %d", code)
+	}
+
+	code, _ = e.do(t, "PUT", "/api/chats/"+itoa(adminID)+"/messages/"+itoa(msgID), student, map[string]any{"body": "  "})
+	if code != 400 {
+		t.Fatalf("empty edit: %d", code)
+	}
+
+	code, body = e.do(t, "GET", "/api/chats/"+itoa(adminID)+"/messages", student, nil)
+	if code != 200 {
+		t.Fatalf("list: %d %v", code, body)
+	}
+	msgs := body["messages"].([]any)
+	last := msgs[len(msgs)-1].(map[string]any)
+	if last["body"] != "سلام ویرایش" || last["editedAt"] == nil {
+		t.Fatalf("listed message not edited: %v", last)
+	}
+}
+
+func TestChatReplaceAttachment(t *testing.T) {
+	e := setup(t)
+	student, studentID := register(t, e, "Media Editor", "media-editor@test.dev")
+	admin := login(t, e, bootstrapAdminEmail)
+	code, me := e.do(t, "GET", "/api/auth/me", admin, nil)
+	if code != 200 {
+		t.Fatalf("me: %d %v", code, me)
+	}
+	adminID := int64(me["user"].(map[string]any)["id"].(float64))
+
+	png := []byte{0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00}
+	code, up := uploadChatFile(t, e, student, "one.png", png)
+	if code != 201 {
+		t.Fatalf("upload: %d %v", code, up)
+	}
+	first := up["attachment"].(map[string]any)
+
+	code, body := e.do(t, "POST", "/api/chats/"+itoa(adminID)+"/messages", student, map[string]any{
+		"body":       "",
+		"attachment": first,
+	})
+	if code != 201 {
+		t.Fatalf("send: %d %v", code, body)
+	}
+	msg := body["message"].(map[string]any)
+	msgID := int64(msg["id"].(float64))
+	oldPath := mediaPath(msg["attachment"].(map[string]any)["url"])
+
+	png[8] = 0x01
+	code, up = uploadChatFile(t, e, student, "two.png", png)
+	if code != 201 {
+		t.Fatalf("upload replacement: %d %v", code, up)
+	}
+	next := up["attachment"].(map[string]any)
+
+	code, body = e.do(t, "PUT", "/api/chats/"+itoa(adminID)+"/messages/"+itoa(msgID), student, map[string]any{
+		"body":       "",
+		"attachment": next,
+	})
+	if code != 200 {
+		t.Fatalf("replace: %d %v", code, body)
+	}
+	edited := body["message"].(map[string]any)
+	newPath := mediaPath(edited["attachment"].(map[string]any)["url"])
+	if edited["editedAt"] == nil || newPath == "" || newPath == oldPath {
+		t.Fatalf("expected a replaced attachment, old %s new %v", oldPath, edited)
+	}
+	if edited["attachment"].(map[string]any)["type"] != "image" {
+		t.Fatalf("type: %v", edited["attachment"])
+	}
+
+	wrong := map[string]any{"type": "video", "url": next["url"], "name": "clip.mp4", "size": next["size"]}
+	code, _ = e.do(t, "PUT", "/api/chats/"+itoa(adminID)+"/messages/"+itoa(msgID), student, map[string]any{
+		"body":       "",
+		"attachment": wrong,
+	})
+	if code != 404 {
+		t.Fatalf("different kind should miss: %d", code)
+	}
+
+	code, _ = e.do(t, "PUT", "/api/chats/"+itoa(adminID)+"/messages/"+itoa(msgID), student, map[string]any{
+		"body":       "",
+		"attachment": map[string]any{"type": "file", "url": next["url"], "name": "x.pdf", "size": 1},
+	})
+	if code != 400 {
+		t.Fatalf("file replace: %d", code)
+	}
+
+	code, _ = e.do(t, "PUT", "/api/chats/"+itoa(studentID)+"/messages/"+itoa(msgID), admin, map[string]any{
+		"body":       "",
+		"attachment": next,
+	})
+	if code != 400 {
+		t.Fatalf("partner replace: %d", code)
+	}
+}
+
+func TestChatReadMarksOnlyIncoming(t *testing.T) {
+	e := setup(t)
+	student, studentID := register(t, e, "Seen Student", "seen-student@test.dev")
+	admin := login(t, e, bootstrapAdminEmail)
+	code, me := e.do(t, "GET", "/api/auth/me", admin, nil)
+	if code != 200 {
+		t.Fatalf("me: %d %v", code, me)
+	}
+	adminID := int64(me["user"].(map[string]any)["id"].(float64))
+
+	code, body := e.do(t, "POST", "/api/chats/"+itoa(adminID)+"/messages", student, map[string]any{"body": "از هنرجو"})
+	if code != 201 {
+		t.Fatalf("student send: %d %v", code, body)
+	}
+	studentMsg := int64(body["message"].(map[string]any)["id"].(float64))
+
+	code, body = e.do(t, "GET", "/api/chats/"+itoa(adminID)+"/messages", student, nil)
+	if code != 200 {
+		t.Fatalf("student list: %d %v", code, body)
+	}
+	if chatMsg(t, body, studentMsg)["readAt"] != nil {
+		t.Fatalf("opening my own thread marked it seen: %v", chatMsg(t, body, studentMsg))
+	}
+
+	code, body = e.do(t, "GET", "/api/chats/"+itoa(studentID)+"/messages", admin, nil)
+	if code != 200 {
+		t.Fatalf("admin list: %d %v", code, body)
+	}
+	if chatMsg(t, body, studentMsg)["readAt"] == nil {
+		t.Fatalf("partner open should mark the incoming message seen")
+	}
+
+	code, body = e.do(t, "POST", "/api/chats/"+itoa(studentID)+"/messages", admin, map[string]any{"body": "از ادمین"})
+	if code != 201 {
+		t.Fatalf("admin send: %d %v", code, body)
+	}
+	adminMsg := int64(body["message"].(map[string]any)["id"].(float64))
+
+	code, body = e.do(t, "GET", "/api/chats/"+itoa(studentID)+"/messages", admin, nil)
+	if code != 200 {
+		t.Fatalf("admin list again: %d %v", code, body)
+	}
+	if chatMsg(t, body, adminMsg)["readAt"] != nil {
+		t.Fatalf("admin own message was marked seen: %v", chatMsg(t, body, adminMsg))
+	}
+	if chatMsg(t, body, studentMsg)["readAt"] == nil {
+		t.Fatalf("already seen incoming message lost its receipt")
+	}
+}
+
+func chatMsg(t *testing.T, body map[string]any, id int64) map[string]any {
+	t.Helper()
+	for _, raw := range body["messages"].([]any) {
+		msg := raw.(map[string]any)
+		if int64(msg["id"].(float64)) == id {
+			return msg
+		}
+	}
+	t.Fatalf("message %d missing in %v", id, body["messages"])
+	return nil
+}
+
+func mediaPath(raw any) string {
+	s, _ := raw.(string)
+	if i := strings.IndexByte(s, '?'); i >= 0 {
+		return s[:i]
+	}
+	return s
+}
+
+func TestLearningDetailMatchesActiveStudents(t *testing.T) {
+	e := setup(t)
+	admin := login(t, e, bootstrapAdminEmail)
+
+	code, body := e.do(t, "GET", "/api/admin/stats", admin, nil)
+	if code != 200 {
+		t.Fatalf("stats: %d %v", code, body)
+	}
+	if body["stats"].(map[string]any)["users"].(float64) != 0 {
+		t.Fatalf("overview should ignore staff, got %v", body["stats"])
+	}
+
+	_, uid := register(t, e, "Active Student", "active-student@test.dev")
+
+	code, body = e.do(t, "GET", "/api/admin/stats", admin, nil)
+	if code != 200 {
+		t.Fatalf("stats after student: %d %v", code, body)
+	}
+	if body["stats"].(map[string]any)["users"].(float64) != 1 {
+		t.Fatalf("expected 1 active student, got %v", body["stats"])
+	}
+
+	code, body = e.do(t, "GET", "/api/admin/learning/overview", admin, nil)
+	if code != 200 {
+		t.Fatalf("overview: %d %v", code, body)
+	}
+	if body["overview"].(map[string]any)["studentsActive"].(float64) != 1 {
+		t.Fatalf("learning active mismatch: %v", body["overview"])
+	}
+
+	code, body = e.do(t, "GET", "/api/admin/users/"+itoa(uid)+"/learning", admin, nil)
+	if code != 200 {
+		t.Fatalf("learning detail: %d %v", code, body)
+	}
+	user := body["learning"].(map[string]any)["user"].(map[string]any)
+	if user["name"] != "Active Student" {
+		t.Fatalf("detail user: %v", user)
+	}
+
+	code, body = e.do(t, "GET", "/api/admin/users/999999/learning", admin, nil)
+	if code != 404 {
+		t.Fatalf("missing user: %d %v", code, body)
+	}
+
+	code, body = e.do(t, "GET", "/api/admin/learning/students?page=1&pageSize=10", admin, nil)
+	if code != 200 {
+		t.Fatalf("students page: %d %v", code, body)
+	}
+	if body["total"].(float64) != 1 || len(body["items"].([]any)) != 1 {
+		t.Fatalf("expected one page row, got %v", body)
+	}
+}
+
+func TestInviteStatusFilter(t *testing.T) {
+	e := setup(t)
+	admin := login(t, e, bootstrapAdminEmail)
+	code, body := e.do(t, "POST", "/api/admin/invites", admin, map[string]any{"maxUses": 2, "label": "مهر"})
+	if code != 201 {
+		t.Fatalf("create invite: %d %v", code, body)
+	}
+	code, body = e.do(t, "GET", "/api/admin/invites?status=active", admin, nil)
+	if code != 200 {
+		t.Fatalf("active filter: %d %v", code, body)
+	}
+	if body["total"].(float64) < 1 {
+		t.Fatalf("expected active invites, got %v", body)
+	}
+	code, body = e.do(t, "GET", "/api/admin/invites?status=revoked", admin, nil)
+	if code != 200 {
+		t.Fatalf("revoked filter: %d %v", code, body)
+	}
+	if body["total"].(float64) != 0 {
+		t.Fatalf("expected no revoked invites, got %v", body)
+	}
+	code, body = e.do(t, "GET", "/api/admin/invites?status=nope", admin, nil)
+	if code != 400 {
+		t.Fatalf("bad status: %d %v", code, body)
+	}
+}
+
+func TestPublicProfileOmitsPrivateFields(t *testing.T) {
+	e := setup(t)
+	student, studentID := register(t, e, "Public Name", "public-name@test.dev")
+	admin := login(t, e, bootstrapAdminEmail)
+	code, me := e.do(t, "GET", "/api/auth/me", admin, nil)
+	if code != 200 {
+		t.Fatalf("me: %d %v", code, me)
+	}
+	adminID := int64(me["user"].(map[string]any)["id"].(float64))
+
+	code, body := e.do(t, "GET", "/api/users/"+itoa(adminID), student, nil)
+	if code != 200 {
+		t.Fatalf("profile: %d %v", code, body)
+	}
+	user := body["user"].(map[string]any)
+	if user["name"] == nil || user["name"] == "" {
+		t.Fatalf("missing name: %v", user)
+	}
+	if _, ok := user["email"]; ok {
+		t.Fatalf("email must not be public: %v", user)
+	}
+	if _, ok := user["phone"]; ok {
+		t.Fatalf("phone must not be public: %v", user)
+	}
+
+	code, adminView := e.do(t, "GET", "/api/admin/users/"+itoa(studentID), admin, nil)
+	if code != 200 {
+		t.Fatalf("admin user: %d %v", code, adminView)
+	}
+	managed := adminView["user"].(map[string]any)
+	if managed["email"] != "public-name@test.dev" {
+		t.Fatalf("admin should see email: %v", managed)
+	}
+	if _, ok := managed["passwordHash"]; ok {
+		t.Fatalf("password hash must stay hidden: %v", managed)
+	}
+	code, hidden := e.do(t, "GET", "/api/admin/users/"+itoa(adminID), student, nil)
+	if code != 403 {
+		t.Fatalf("student must not open admin user: %d %v", code, hidden)
+	}
+
+	code, body = e.do(t, "GET", "/api/users/"+itoa(studentID), admin, nil)
+	if code != 200 {
+		t.Fatalf("student profile: %d %v", code, body)
+	}
+	if body["user"].(map[string]any)["username"] != "public-name" {
+		t.Fatalf("username: %v", body["user"])
+	}
+}

backend/internal/config/config.go

@@ -46,6 +46,9 @@ type Config struct {
 	PhysicalCertEnabled    bool
 	PhysicalCertPriceIRR   int
 	PhysicalCertWindowDays int
+	// RegistrationEnforceIP limits one successful registration per client IP.
+	// Default false: behind NAT / shared egress the peer IP is not a real client identity.
+	RegistrationEnforceIP bool
 }
 
 func getEnv(key, fallback string) string {
@@ -140,6 +143,7 @@ func Load() *Config {
 		PhysicalCertEnabled:    getEnv("PHYSICAL_CERT_ENABLED", "false") == "true",
 		PhysicalCertPriceIRR:   getEnvInt("PHYSICAL_CERT_PRICE_IRR", 2_500_000),
 		PhysicalCertWindowDays: getEnvInt("PHYSICAL_CERT_WINDOW_DAYS", 30),
+		RegistrationEnforceIP:  getEnv("REGISTRATION_ENFORCE_IP", "false") == "true",
 	}
 }
 

backend/internal/db/migrations/0022_chat_message_edits.sql

@@ -0,0 +1,3 @@
+-- Own-message edits. Nullable so existing rows stay unedited.
+ALTER TABLE chat_messages
+    ADD COLUMN IF NOT EXISTS edited_at TIMESTAMPTZ;

backend/internal/models/models.go

@@ -219,6 +219,7 @@ type ChatMessage struct {
 	ReplyTo    *int64         `json:"replyTo,omitempty"`
 	PinnedAt   *time.Time     `json:"pinnedAt,omitempty"`
 	Pinned     bool           `json:"pinned"`
+	EditedAt   *time.Time     `json:"editedAt,omitempty"`
 	Attachment *Attachment    `json:"attachment,omitempty"`
 	Reactions  []ChatReaction `json:"reactions,omitempty"`
 }

backend/internal/storage/mime_test.go

@@ -0,0 +1,15 @@
+package storage
+
+import "testing"
+
+func TestVoiceNoteContentType(t *testing.T) {
+	if got := mimeType("chats/2-1.weba"); got != "audio/webm" {
+		t.Fatalf("weba: %s", got)
+	}
+	if got := mediaContentType("chats/2-1.weba", "application/octet-stream"); got != "audio/webm" {
+		t.Fatalf("generic store type must not hide the voice type: %s", got)
+	}
+	if got := mediaContentType("chats/2-1.bin", "application/pdf"); got != "application/pdf" {
+		t.Fatalf("unknown extension keeps the stored type: %s", got)
+	}
+}

backend/internal/storage/storage.go

@@ -243,10 +243,11 @@ func (s *S3) Serve(w http.ResponseWriter, r *http.Request, key string) error {
 	}
 	defer result.Body.Close()
 
-	ct := mimeType(key)
+	stored := ""
-	if result.ContentType != nil && *result.ContentType != "" {
+	if result.ContentType != nil {
-		ct = *result.ContentType
+		stored = *result.ContentType
 	}
+	ct := mediaContentType(key, stored)
 	w.Header().Set("Content-Type", ct)
 	setInlineMediaHeaders(w, ct)
 	w.Header().Set("Accept-Ranges", "bytes")
@@ -290,8 +291,20 @@ func mimeType(key string) string {
 		return "video/mp4"
 	case ".webm":
 		return "video/webm"
+	case ".weba":
+		return "audio/webm"
 	case ".mp3":
 		return "audio/mpeg"
+	case ".wav":
+		return "audio/wav"
+	case ".ogg", ".opus":
+		return "audio/ogg"
+	case ".m4a", ".aac":
+		return "audio/mp4"
+	case ".mov":
+		return "video/quicktime"
+	case ".m4v":
+		return "video/mp4"
 	case ".pdf":
 		return "application/pdf"
 	default:
@@ -299,6 +312,23 @@ func mimeType(key string) string {
 	}
 }
 
+// mediaContentType keeps a known extension ahead of a generic object-store type.
+// Voice notes are stored as .weba; a default octet-stream plus nosniff stops playback.
+func mediaContentType(key, stored string) string {
+	guessed := mimeType(key)
+	if guessed != "application/octet-stream" {
+		return guessed
+	}
+	stored = strings.TrimSpace(stored)
+	if i := strings.Index(stored, ";"); i >= 0 {
+		stored = strings.TrimSpace(stored[:i])
+	}
+	if stored != "" {
+		return stored
+	}
+	return guessed
+}
+
 // setInlineMediaHeaders discourages "Save as" download UX while keeping streaming/Range intact.
 func setInlineMediaHeaders(w http.ResponseWriter, contentType string) {
 	if contentType != "" {

backend/internal/store/invites.go

@@ -146,7 +146,7 @@ func (s *Store) CreateRegistrationInvite(
 	return scanInvite(row)
 }
 
-func (s *Store) ListRegistrationInvites(ctx context.Context, query string, limit, offset int) ([]models.RegistrationInvite, int64, error) {
+func (s *Store) ListRegistrationInvites(ctx context.Context, query, status string, limit, offset int) ([]models.RegistrationInvite, int64, error) {
 	if limit <= 0 {
 		limit = 10
 	}
@@ -157,18 +157,21 @@ func (s *Store) ListRegistrationInvites(ctx context.Context, query string, limit
 		offset = 0
 	}
 	query = strings.TrimSpace(query)
+	status = strings.TrimSpace(status)
 	var total int64
 	if err := s.pool.QueryRow(ctx, `
 		SELECT COUNT(*) FROM registration_invites
-		WHERE ($1 = '' OR COALESCE(label, '') ILIKE '%'||$1||'%')`, query).Scan(&total); err != nil {
+		WHERE ($1 = '' OR COALESCE(label, '') ILIKE '%'||$1||'%')
+		  AND ($2 = '' OR status = $2)`, query, status).Scan(&total); err != nil {
 		return nil, 0, err
 	}
 	rows, err := s.pool.Query(ctx, `
 		SELECT `+inviteCols+`
 		FROM registration_invites
 		WHERE ($1 = '' OR COALESCE(label, '') ILIKE '%'||$1||'%')
+		  AND ($2 = '' OR status = $2)
 		ORDER BY created_at DESC
-		LIMIT $2 OFFSET $3`, query, limit, offset)
+		LIMIT $3 OFFSET $4`, query, status, limit, offset)
 	if err != nil {
 		return nil, 0, err
 	}
@@ -344,16 +347,14 @@ func EvaluateInviteAvailability(inv *models.RegistrationInvite, now time.Time) e
 	return nil
 }
 
-// RegisterInviteStudent creates a student, consumes the IP, and atomically consumes one invite seat.
+// RegisterInviteStudent creates a student, optionally records the client IP, and consumes one invite seat.
+// Empty ip skips one-registration-per-IP enforcement (NAT / shared egress).
 func (s *Store) RegisterInviteStudent(
 	ctx context.Context,
 	inviteID int64,
 	name, email, username, passwordHash, phone, securityQuestion, securityAnswerHash, ip string,
 ) (*models.User, error) {
 	ip = strings.TrimSpace(ip)
-	if ip == "" {
-		return nil, errors.New("empty registration ip")
-	}
 	tx, err := s.pool.Begin(ctx)
 	if err != nil {
 		return nil, err
@@ -366,12 +367,14 @@ func (s *Store) RegisterInviteStudent(
 		return nil, ErrPhoneBlacklisted
 	}
 
-	var taken bool
+	if ip != "" {
-	if err := tx.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM registration_ips WHERE ip=$1)`, ip).Scan(&taken); err != nil {
+		var taken bool
-		return nil, err
+		if err := tx.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM registration_ips WHERE ip=$1)`, ip).Scan(&taken); err != nil {
-	}
+			return nil, err
-	if taken {
+		}
-		return nil, ErrRegistrationIPTaken
+		if taken {
+			return nil, ErrRegistrationIPTaken
+		}
 	}
 
 	tag, err := tx.Exec(ctx, `
@@ -436,12 +439,14 @@ func (s *Store) RegisterInviteStudent(
 		ON CONFLICT (user_id) DO NOTHING`, u.ID); err != nil {
 		return nil, err
 	}
-	if _, err := tx.Exec(ctx, `
+	if ip != "" {
-		INSERT INTO registration_ips (ip, user_id) VALUES ($1, $2)`, ip, u.ID); err != nil {
+		if _, err := tx.Exec(ctx, `
-		if isUniqueViolation(err) {
+			INSERT INTO registration_ips (ip, user_id) VALUES ($1, $2)`, ip, u.ID); err != nil {
-			return nil, ErrRegistrationIPTaken
+			if isUniqueViolation(err) {
+				return nil, ErrRegistrationIPTaken
+			}
+			return nil, err
 		}
-		return nil, err
 	}
 	if err := tx.Commit(ctx); err != nil {
 		return nil, err

backend/internal/store/learning.go

@@ -7,17 +7,17 @@ import (
 
 // LearningOverview is cohort-level learning analytics for staff.
 type LearningOverview struct {
-	StudentsActive   int64   `json:"studentsActive"`
+	StudentsActive    int64   `json:"studentsActive"`
-	StudentsLocked   int64   `json:"studentsLocked"`
+	StudentsLocked    int64   `json:"studentsLocked"`
-	StudentsTotal    int64   `json:"studentsTotal"`
+	StudentsTotal     int64   `json:"studentsTotal"`
-	LessonsTotal     int64   `json:"lessonsTotal"`
+	LessonsTotal      int64   `json:"lessonsTotal"`
-	Completions      int64   `json:"completions"`
+	Completions       int64   `json:"completions"`
-	Attempts7d       int64   `json:"attempts7d"`
+	Attempts7d        int64   `json:"attempts7d"`
-	Passes7d         int64   `json:"passes7d"`
+	Passes7d          int64   `json:"passes7d"`
-	PassRate7d       float64 `json:"passRate7d"`
+	PassRate7d        float64 `json:"passRate7d"`
-	AvgWatchPct      float64 `json:"avgWatchPct"`
+	AvgWatchPct       float64 `json:"avgWatchPct"`
-	XPAwarded7d      int64   `json:"xpAwarded7d"`
+	XPAwarded7d       int64   `json:"xpAwarded7d"`
-	StudentsStreaking int64  `json:"studentsStreaking"`
+	StudentsStreaking int64   `json:"studentsStreaking"`
 }
 
 func (s *Store) LearningOverview(ctx context.Context) (*LearningOverview, error) {
@@ -81,10 +81,40 @@ type StudentLearningRow struct {
 	LastActivityAt *time.Time `json:"lastActivityAt,omitempty"`
 }
 
-func (s *Store) ListStudentLearning(ctx context.Context, q string) ([]StudentLearningRow, error) {
+func (s *Store) ListStudentLearning(ctx context.Context, q, filter, sort string, limit, offset int) ([]StudentLearningRow, int64, error) {
+	if limit <= 0 {
+		limit = 10
+	}
+	if limit > 100 {
+		limit = 100
+	}
+	if offset < 0 {
+		offset = 0
+	}
 	var lessonsTotal int64
 	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM lessons WHERE is_active`).Scan(&lessonsTotal); err != nil {
-		return nil, err
+		return nil, 0, err
+	}
+	where := `u.role = 'student'
+			AND ($1 = '' OR u.name ILIKE '%'||$1||'%' OR u.username ILIKE '%'||$1||'%' OR u.email ILIKE '%'||$1||'%')`
+	switch filter {
+	case "active":
+		where += ` AND u.is_active AND NOT u.is_locked`
+	case "locked":
+		where += ` AND u.is_locked`
+	}
+	order := `u.xp DESC, u.id ASC`
+	switch sort {
+	case "progress":
+		order = `COALESCE(p.passed, 0) DESC, u.id ASC`
+	case "streak":
+		order = `u.streak_current DESC, u.id ASC`
+	case "activity":
+		order = `u.last_activity_date DESC NULLS LAST, u.id ASC`
+	}
+	var total int64
+	if err := s.pool.QueryRow(ctx, `SELECT COUNT(*) FROM users u WHERE `+where, q).Scan(&total); err != nil {
+		return nil, 0, err
 	}
 	rows, err := s.pool.Query(ctx, `
 		SELECT u.id, u.name, u.username, u.email, u.xp, u.hearts, u.streak_current,
@@ -105,12 +135,11 @@ func (s *Store) ListStudentLearning(ctx context.Context, q string) ([]StudentLea
 			WHERE created_at >= now() - interval '7 days'
 			GROUP BY user_id
 		) a ON a.user_id = u.id
-		WHERE u.role = 'student'
+		WHERE `+where+`
-			AND ($1 = '' OR u.name ILIKE '%'||$1||'%' OR u.username ILIKE '%'||$1||'%' OR u.email ILIKE '%'||$1||'%')
+		ORDER BY `+order+`
-		ORDER BY u.xp DESC, u.id ASC
+		LIMIT $2 OFFSET $3`, q, limit, offset)
-		LIMIT 500`, q)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 	defer rows.Close()
 	out := make([]StudentLearningRow, 0)
@@ -122,7 +151,7 @@ func (s *Store) ListStudentLearning(ctx context.Context, q string) ([]StudentLea
 			&r.IsLocked, &r.IsActive, &r.LastActivityAt,
 			&r.LessonsPassed, &r.Attempts7d, &r.Passes7d,
 		); err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 		if r.LessonsTotal > 0 {
 			r.ProgressPct = float64(r.LessonsPassed) / float64(r.LessonsTotal) * 100
@@ -132,21 +161,21 @@ func (s *Store) ListStudentLearning(ctx context.Context, q string) ([]StudentLea
 		}
 		out = append(out, r)
 	}
-	return out, rows.Err()
+	return out, total, rows.Err()
 }
 
 type LessonLearningDetail struct {
-	LessonID        int64      `json:"lessonId"`
+	LessonID          int64      `json:"lessonId"`
-	ChapterID       int64      `json:"chapterId"`
+	ChapterID         int64      `json:"chapterId"`
-	ChapterTitle    string     `json:"chapterTitle"`
+	ChapterTitle      string     `json:"chapterTitle"`
-	Title           string     `json:"title"`
+	Title             string     `json:"title"`
-	SortOrder       int        `json:"sortOrder"`
+	SortOrder         int        `json:"sortOrder"`
-	WatchedPct      float64    `json:"watchedPct"`
+	WatchedPct        float64    `json:"watchedPct"`
-	QuizUnlocked    bool       `json:"quizUnlocked"`
+	QuizUnlocked      bool       `json:"quizUnlocked"`
-	PassedQuiz      bool       `json:"passedQuiz"`
+	PassedQuiz        bool       `json:"passedQuiz"`
-	QuizCompletedAt *time.Time `json:"quizCompletedAt,omitempty"`
+	QuizCompletedAt   *time.Time `json:"quizCompletedAt,omitempty"`
-	LastAttemptStatus string   `json:"lastAttemptStatus,omitempty"`
+	LastAttemptStatus string     `json:"lastAttemptStatus,omitempty"`
-	LastAttemptScore  float64  `json:"lastAttemptScore,omitempty"`
+	LastAttemptScore  float64    `json:"lastAttemptScore,omitempty"`
 }
 
 type AttemptLearningDetail struct {
@@ -178,11 +207,11 @@ type WatchSessionDetail struct {
 }
 
 type UserLearningDetail struct {
-	User      StudentLearningRow      `json:"user"`
+	User     StudentLearningRow      `json:"user"`
-	Lessons   []LessonLearningDetail  `json:"lessons"`
+	Lessons  []LessonLearningDetail  `json:"lessons"`
-	Attempts  []AttemptLearningDetail `json:"attempts"`
+	Attempts []AttemptLearningDetail `json:"attempts"`
-	XPEvents  []XPEventDetail         `json:"xpEvents"`
+	XPEvents []XPEventDetail         `json:"xpEvents"`
-	Sessions  []WatchSessionDetail    `json:"sessions"`
+	Sessions []WatchSessionDetail    `json:"sessions"`
 }
 
 func (s *Store) UserLearningDetail(ctx context.Context, userID int64) (*UserLearningDetail, error) {
@@ -190,30 +219,28 @@ func (s *Store) UserLearningDetail(ctx context.Context, userID int64) (*UserLear
 	if err != nil {
 		return nil, err
 	}
-	list, err := s.ListStudentLearning(ctx, "")
+	row := StudentLearningRow{
-	if err != nil {
+		ID: u.ID, Name: u.Name, Username: u.Username, Email: u.Email,
+		XP: u.XP, Hearts: u.Hearts, StreakCurrent: u.StreakCurrent,
+		IsLocked: u.IsLocked, IsActive: u.IsActive, LastActivityAt: u.LastActivityDate,
+	}
+	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM lessons WHERE is_active`).Scan(&row.LessonsTotal); err != nil {
 		return nil, err
 	}
-	var row StudentLearningRow
+	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM lesson_progress WHERE user_id=$1 AND passed_quiz`, userID).Scan(&row.LessonsPassed); err != nil {
-	found := false
+		return nil, err
-	for _, r := range list {
-		if r.ID == userID {
-			row = r
-			found = true
-			break
-		}
 	}
-	if !found {
+	if row.LessonsTotal > 0 {
-		row = StudentLearningRow{
+		row.ProgressPct = float64(row.LessonsPassed) / float64(row.LessonsTotal) * 100
-			ID: u.ID, Name: u.Name, Username: u.Username, Email: u.Email,
+	}
-			XP: u.XP, Hearts: u.Hearts, StreakCurrent: u.StreakCurrent,
+	if err := s.pool.QueryRow(ctx, `
-			IsLocked: u.IsLocked, IsActive: u.IsActive, LastActivityAt: u.LastActivityDate,
+		SELECT COUNT(*), COUNT(*) FILTER (WHERE status='passed')
-		}
+		FROM quiz_attempts
-		_ = s.pool.QueryRow(ctx, `SELECT count(*) FROM lessons WHERE is_active`).Scan(&row.LessonsTotal)
+		WHERE user_id=$1 AND created_at >= now() - interval '7 days'`, userID).Scan(&row.Attempts7d, &row.Passes7d); err != nil {
-		_ = s.pool.QueryRow(ctx, `SELECT count(*) FROM lesson_progress WHERE user_id=$1 AND passed_quiz`, userID).Scan(&row.LessonsPassed)
+		return nil, err
-		if row.LessonsTotal > 0 {
+	}
-			row.ProgressPct = float64(row.LessonsPassed) / float64(row.LessonsTotal) * 100
+	if row.Attempts7d > 0 {
-		}
+		row.PassRate7d = float64(row.Passes7d) / float64(row.Attempts7d) * 100
 	}
 
 	detail := &UserLearningDetail{User: row, Lessons: []LessonLearningDetail{}, Attempts: []AttemptLearningDetail{}, XPEvents: []XPEventDetail{}, Sessions: []WatchSessionDetail{}}
@@ -221,7 +248,7 @@ func (s *Store) UserLearningDetail(ctx context.Context, userID int64) (*UserLear
 	lrows, err := s.pool.Query(ctx, `
 		SELECT l.id, l.chapter_id, c.title, l.title, l.sort_order,
 			COALESCE(p.watched_pct, 0), COALESCE(p.quiz_unlocked, false), COALESCE(p.passed_quiz, false), p.quiz_completed_at,
-			COALESCE(la.status, ''), COALESCE(la.score_pct, 0)
+			COALESCE(la.status::text, ''), COALESCE(la.score_pct, 0)
 		FROM lessons l
 		JOIN chapters c ON c.id = l.chapter_id
 		LEFT JOIN lesson_progress p ON p.lesson_id = l.id AND p.user_id = $1

backend/internal/store/learning_test.go

@@ -28,7 +28,7 @@ func TestLearningOverviewSmoke(t *testing.T) {
 	if o == nil {
 		t.Fatal("nil overview")
 	}
-	students, err := st.ListStudentLearning(ctx, "")
+	students, _, err := st.ListStudentLearning(ctx, "", "", "xp", 10, 0)
 	if err != nil {
 		t.Fatal(err)
 	}

backend/internal/store/store.go

@@ -331,18 +331,15 @@ func (s *Store) HasRegistrationIP(ctx context.Context, ip string) (bool, error)
 	return exists, err
 }
 
-// RegisterPublicStudent creates a student and consumes the IP atomically.
+// RegisterPublicStudent creates a student and optionally records the client IP.
 // When requireWhitelist is true, the phone must be an available whitelist entry.
-// Concurrent same-IP registrations: one commits; the other rolls back on unique IP conflict.
+// Empty ip skips one-registration-per-IP enforcement (NAT / shared egress).
 func (s *Store) RegisterPublicStudent(
 	ctx context.Context,
 	name, email, username, passwordHash, phone, securityQuestion, securityAnswerHash, ip string,
 	requireWhitelist bool,
 ) (*models.User, error) {
 	ip = strings.TrimSpace(ip)
-	if ip == "" {
-		return nil, errors.New("empty registration ip")
-	}
 	tx, err := s.pool.Begin(ctx)
 	if err != nil {
 		return nil, err
@@ -355,12 +352,14 @@ func (s *Store) RegisterPublicStudent(
 		return nil, ErrPhoneBlacklisted
 	}
 
-	var taken bool
+	if ip != "" {
-	if err := tx.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM registration_ips WHERE ip=$1)`, ip).Scan(&taken); err != nil {
+		var taken bool
-		return nil, err
+		if err := tx.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM registration_ips WHERE ip=$1)`, ip).Scan(&taken); err != nil {
-	}
+			return nil, err
-	if taken {
+		}
-		return nil, ErrRegistrationIPTaken
+		if taken {
+			return nil, ErrRegistrationIPTaken
+		}
 	}
 
 	row := tx.QueryRow(ctx, `
@@ -380,12 +379,14 @@ func (s *Store) RegisterPublicStudent(
 		ON CONFLICT (user_id) DO NOTHING`, u.ID); err != nil {
 		return nil, err
 	}
-	if _, err := tx.Exec(ctx, `
+	if ip != "" {
-		INSERT INTO registration_ips (ip, user_id) VALUES ($1, $2)`, ip, u.ID); err != nil {
+		if _, err := tx.Exec(ctx, `
-		if isUniqueViolation(err) {
+			INSERT INTO registration_ips (ip, user_id) VALUES ($1, $2)`, ip, u.ID); err != nil {
-			return nil, ErrRegistrationIPTaken
+			if isUniqueViolation(err) {
+				return nil, ErrRegistrationIPTaken
+			}
+			return nil, err
 		}
-		return nil, err
 	}
 	if err := tx.Commit(ctx); err != nil {
 		return nil, err
@@ -503,7 +504,26 @@ func (s *Store) GetPhysicalOrder(ctx context.Context, id int64) (*models.Certifi
 	return scanPhysicalOrder(row)
 }
 
-func (s *Store) ListPhysicalOrders(ctx context.Context, status string) ([]models.CertificatePhysicalOrder, error) {
+func (s *Store) ListPhysicalOrders(ctx context.Context, status string, limit, offset int) ([]models.CertificatePhysicalOrder, int64, error) {
+	if limit <= 0 {
+		limit = 10
+	}
+	if limit > 100 {
+		limit = 100
+	}
+	if offset < 0 {
+		offset = 0
+	}
+	where := ""
+	args := []any{}
+	if status != "" {
+		where = ` WHERE o.status=$1`
+		args = append(args, status)
+	}
+	var total int64
+	if err := s.pool.QueryRow(ctx, `SELECT COUNT(*) FROM certificate_physical_orders o`+where, args...).Scan(&total); err != nil {
+		return nil, 0, err
+	}
 	q := `
 		SELECT o.id, o.certificate_id, o.user_id, o.status, o.note,
 			o.recipient_name, o.phone, o.address, o.city, o.postal_code, o.tracking_code,
@@ -511,16 +531,11 @@ func (s *Store) ListPhysicalOrders(ctx context.Context, status string) ([]models
 			u.name, c.public_id
 		FROM certificate_physical_orders o
 		JOIN users u ON u.id = o.user_id
-		JOIN certificates c ON c.id = o.certificate_id`
+		JOIN certificates c ON c.id = o.certificate_id` + where + ` ORDER BY o.created_at DESC LIMIT $` + strconv.Itoa(len(args)+1) + ` OFFSET $` + strconv.Itoa(len(args)+2)
-	args := []any{}
+	args = append(args, limit, offset)
-	if status != "" {
-		q += ` WHERE o.status=$1`
-		args = append(args, status)
-	}
-	q += ` ORDER BY o.created_at DESC LIMIT 200`
 	rows, err := s.pool.Query(ctx, q, args...)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 	defer rows.Close()
 	out := make([]models.CertificatePhysicalOrder, 0)
@@ -529,11 +544,11 @@ func (s *Store) ListPhysicalOrders(ctx context.Context, status string) ([]models
 		if err := rows.Scan(&o.ID, &o.CertificateID, &o.UserID, &o.Status, &o.Note,
 			&o.RecipientName, &o.Phone, &o.Address, &o.City, &o.PostalCode, &o.TrackingCode,
 			&o.WindowEndsAt, &o.CreatedAt, &o.UpdatedAt, &o.UserName, &o.PublicID); err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 		out = append(out, o)
 	}
-	return out, rows.Err()
+	return out, total, rows.Err()
 }
 
 func (s *Store) UpdatePhysicalOrder(ctx context.Context, id int64, status models.PhysicalOrderStatus, note, tracking string) (*models.CertificatePhysicalOrder, error) {
@@ -1068,7 +1083,7 @@ func (s *Store) AddChatMessage(ctx context.Context, userID, mentorID int64, send
 		INSERT INTO chat_messages (user_id, mentor_id, sender_role, body, reply_to, attachment_type, attachment_url, attachment_name, attachment_size)
 		VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)
 		RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at`,
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`,
 		userID, mentorID, senderRole.String(), body, replyTo, attType, attURL, attName, attSize)
 	return scanMessage(row)
 }
@@ -1093,7 +1108,7 @@ func (s *Store) ImportChatMessage(ctx context.Context, userID, mentorID int64, s
 		INSERT INTO chat_messages (user_id, mentor_id, sender_role, body, attachment_type, attachment_url, attachment_name, attachment_size, created_at, pinned_at)
 		VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10)
 		RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at`,
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`,
 		userID, mentorID, senderRole.String(), body, attType, attURL, attName, attSize, createdAt, pinnedAt)
 	return scanMessage(row)
 }
@@ -1137,6 +1152,48 @@ func (s *Store) DeleteChatMessage(ctx context.Context, meID, partnerID, msgID in
 	return tag.RowsAffected() > 0, nil
 }
 
+// ReplaceChatAttachment swaps the photo, video, or voice on one of my messages and marks it edited.
+// The new type must match the current attachment.
+func (s *Store) ReplaceChatAttachment(ctx context.Context, meID, partnerID, msgID int64, meRole models.Role, body, attType, attURL, attName string, attSize int64) (*models.ChatMessage, error) {
+	row := s.pool.QueryRow(ctx, `
+		UPDATE chat_messages
+		SET body=$1, edited_at=now(),
+		    attachment_type=$2, attachment_url=$3, attachment_name=$4, attachment_size=$5
+		WHERE id=$6
+		  AND ((user_id=$7 AND mentor_id=$8) OR (user_id=$8 AND mentor_id=$7))
+		  AND sender_role=$9
+		  AND (user_id=$7 OR mentor_id=$7)
+		  AND attachment_type=$2
+		RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`,
+		body, attType, attURL, attName, attSize, msgID, meID, partnerID, meRole.String())
+	m, err := scanMessage(row)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	return m, err
+}
+
+// EditChatMessage replaces the body of one of my own messages in this conversation.
+func (s *Store) EditChatMessage(ctx context.Context, meID, partnerID, msgID int64, meRole models.Role, body string) (*models.ChatMessage, error) {
+	row := s.pool.QueryRow(ctx, `
+		UPDATE chat_messages
+		SET body=$1, edited_at=now()
+		WHERE id=$2
+		  AND ((user_id=$3 AND mentor_id=$4) OR (user_id=$4 AND mentor_id=$3))
+		  AND sender_role=$5
+		  AND (user_id=$3 OR mentor_id=$3)
+		  AND ($1 <> '' OR attachment_url IS NOT NULL)
+		RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`,
+		body, msgID, meID, partnerID, meRole.String())
+	m, err := scanMessage(row)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	return m, err
+}
+
 const maxPinnedMessages = 3
 
 // TogglePinChatMessage pins or unpins a message. If already at the pin limit,
@@ -1159,7 +1216,7 @@ func (s *Store) TogglePinChatMessage(ctx context.Context, meID, partnerID, msgID
 		out := s.pool.QueryRow(ctx, `
 			UPDATE chat_messages SET pinned_at=NULL WHERE id=$1
 			RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-				attachment_type, attachment_url, attachment_name, attachment_size, pinned_at`, msgID)
+				attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`, msgID)
 		return scanMessage(out)
 	}
 	var n int
@@ -1187,7 +1244,7 @@ func (s *Store) TogglePinChatMessage(ctx context.Context, meID, partnerID, msgID
 	out := s.pool.QueryRow(ctx, `
 		UPDATE chat_messages SET pinned_at=now() WHERE id=$1
 		RETURNING id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at`, msgID)
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at`, msgID)
 	return scanMessage(out)
 }
 
@@ -1195,7 +1252,7 @@ func (s *Store) TogglePinChatMessage(ctx context.Context, meID, partnerID, msgID
 func (s *Store) ListPinnedChatMessages(ctx context.Context, userID, mentorID int64) ([]models.ChatMessage, error) {
 	rows, err := s.pool.Query(ctx, `
 		SELECT id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at
 		FROM chat_messages
 		WHERE pinned_at IS NOT NULL
 		  AND ((user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1))
@@ -1221,7 +1278,7 @@ func (s *Store) ListPinnedChatMessages(ctx context.Context, userID, mentorID int
 func (s *Store) ListChatMessages(ctx context.Context, userID, mentorID, before, limit int64) ([]models.ChatMessage, error) {
 	rows, err := s.pool.Query(ctx, `
 		SELECT id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at
 		FROM chat_messages
 		WHERE ((user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1))
 		  AND ($3 = 0 OR id < $3)
@@ -1269,7 +1326,7 @@ func (s *Store) ListChatMessagesAround(ctx context.Context, userID, partnerID, a
 
 	older, err := s.pool.Query(ctx, `
 		SELECT id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at
 		FROM chat_messages
 		WHERE ((user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1))
 		  AND id <= $3
@@ -1301,7 +1358,7 @@ func (s *Store) ListChatMessagesAround(ctx context.Context, userID, partnerID, a
 
 	newer, err := s.pool.Query(ctx, `
 		SELECT id, user_id, mentor_id, sender_role, body, read_at, created_at, reply_to,
-			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at
+			attachment_type, attachment_url, attachment_name, attachment_size, pinned_at, edited_at
 		FROM chat_messages
 		WHERE ((user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1))
 		  AND id > $3
@@ -1344,7 +1401,7 @@ func scanMessage(row messageScanner) (*models.ChatMessage, error) {
 	var attSize *int64
 	if err := row.Scan(
 		&m.ID, &m.UserID, &m.MentorID, &m.SenderRole, &m.Body, &m.ReadAt, &m.CreatedAt, &m.ReplyTo,
-		&attType, &attURL, &attName, &attSize, &m.PinnedAt,
+		&attType, &attURL, &attName, &attSize, &m.PinnedAt, &m.EditedAt,
 	); err != nil {
 		return nil, err
 	}
@@ -1371,11 +1428,20 @@ func derefInt(p *int64) int64 {
 	return *p
 }
 
-func (s *Store) MarkChatRead(ctx context.Context, userID, mentorID int64) error {
+// MarkChatRead stamps messages the other person sent. Opening the thread must not
-	_, err := s.pool.Exec(ctx, `
+// mark my own messages as seen.
-		UPDATE chat_messages SET read_at=now() WHERE (user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1)`,
+func (s *Store) MarkChatRead(ctx context.Context, meID, partnerID int64, meRole models.Role) (int64, error) {
-		userID, mentorID)
+	tag, err := s.pool.Exec(ctx, `
-	return err
+		UPDATE chat_messages
+		SET read_at=now()
+		WHERE read_at IS NULL
+		  AND sender_role <> $3
+		  AND ((user_id=$1 AND mentor_id=$2) OR (user_id=$2 AND mentor_id=$1))`,
+		meID, partnerID, meRole.String())
+	if err != nil {
+		return 0, err
+	}
+	return tag.RowsAffected(), nil
 }
 
 // MessageInConversation reports whether a message belongs to a given pair.
@@ -1742,7 +1808,7 @@ func (s *Store) AllActiveUserIDs(ctx context.Context) ([]int64, error) {
 
 func (s *Store) Stats(ctx context.Context) (map[string]any, error) {
 	var users, lessons, questions, events, completions int64
-	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM users`).Scan(&users); err != nil {
+	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM users WHERE role='student' AND is_active`).Scan(&users); err != nil {
 		return nil, err
 	}
 	if err := s.pool.QueryRow(ctx, `SELECT count(*) FROM lessons`).Scan(&lessons); err != nil {

deploy/compose/compose.yaml

@@ -23,6 +23,7 @@ x-backend-env: &backend-env
   STORAGE_SECRET_KEY: ${RUSTFS_SECRET_KEY:?RUSTFS_SECRET_KEY must be set}
   STORAGE_BUCKET: ${STORAGE_BUCKET:-pargar}
   SEED_CURRICULUM: ${SEED_CURRICULUM:-false}
+  REGISTRATION_ENFORCE_IP: ${REGISTRATION_ENFORCE_IP:-false}
   ADMIN_NAME: ${ADMIN_NAME:-Admin}
   ADMIN_USERNAME: ${ADMIN_USERNAME:-admin}
   ADMIN_EMAIL: ${ADMIN_EMAIL:-admin@example.com}

deploy/helm/pargar/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: pargar
 description: Pargar gated LMS - Go API, Next.js frontend, Postgres, Redis, S3-compatible storage
 type: application
-version: 0.2.0
+version: 0.2.1
-appVersion: "0.1.0"
+appVersion: "0.1.3"
 keywords:
   - lms
   - pargar

deploy/helm/pargar/templates/backend.yaml

@@ -66,6 +66,8 @@ spec:
               value: {{ .Values.backend.env.devMode | quote }}
             - name: SEED_CURRICULUM
               value: {{ .Values.backend.env.seedCurriculum | quote }}
+            - name: REGISTRATION_ENFORCE_IP
+              value: {{ .Values.backend.env.registrationEnforceIP | quote }}
             - name: ADMIN_NAME
               value: {{ .Values.backend.admin.name | quote }}
             - name: ADMIN_USERNAME

deploy/helm/pargar/values-prod.yaml

@@ -22,7 +22,7 @@ backend:
   replicaCount: 2
   image:
     repository: backend
-    tag: "0.1.0"
+    tag: "0.1.3"
     pullPolicy: IfNotPresent
   existingSecret: pargar-app
   env:
@@ -49,7 +49,7 @@ frontend:
   replicaCount: 2
   image:
     repository: frontend
-    tag: "0.1.0"
+    tag: "0.1.3"
     pullPolicy: IfNotPresent
   resources:
     requests:

deploy/helm/pargar/values.yaml

@@ -44,6 +44,8 @@ backend:
   env:
     devMode: "false"
     seedCurriculum: "false"
+    # false behind NAT / shared egress (peer IP is not a real client).
+    registrationEnforceIP: "false"
     donationEnabled: "true"
     # Offline payment only — leave off until ops process is ready; enable in admin settings.
     physicalCertEnabled: "false"

docs/configuration.md

@@ -63,6 +63,7 @@ One of two patterns:
 |----------|-----------------|--------|
 | `DEV_MODE` | false | Open metrics without token, limited fail-open behavior |
 | `SEED_CURRICULUM` | false (empty in DevMode → true) | Seed lessons/events |
+| `REGISTRATION_ENFORCE_IP` | false | One registration per client IP; keep off behind NAT |
 | `CAPTCHA_EXPOSE_ANSWER` | DevMode only | For tests; never in production |
 | `DONATION_ENABLED` | true | Support card |
 | `DONATION_NOTE` | Copy text | |

docs/product.md

@@ -28,7 +28,7 @@
 
 - Whitelist and blacklist are **mutually exclusive**; import resolves conflicts.
 - A phone already tied to an account cannot re-enter either list as a fresh entry.
-- One account per phone and per IP on registration paths.
+- One account per phone. Optional one-account-per-IP (`REGISTRATION_ENFORCE_IP`, default off — unsuitable behind NAT).
 - Blacklist blocks all registration paths (public + invite) and keeps a failed-attempt history tab.
 
 ## Certificates

docs/security.md

@@ -25,6 +25,10 @@ Public password recovery (`/api/auth/recovery/*` and `/recovery`) is disabled fo
 - Only peers in `TRUSTED_PROXY_CIDRS` are trusted for `X-Forwarded-*` / `X-Real-IP`.
 - CORS: `FRONTEND_ORIGINS` + `PUBLIC_URL` with `AllowCredentials: true`.
 
+## Registration IP binding
+
+`REGISTRATION_ENFORCE_IP` (default **false**) optionally limits one successful public/invite registration per client IP. Leave it off when the app sits behind NAT or shared egress and cannot see real client addresses. Enable only after the edge forwards trustworthy `X-Forwarded-For` / `X-Real-IP` via `TRUSTED_PROXY_CIDRS`.
+
 ## Rate limiting
 
 | Scope | Approximate behavior |
@@ -34,7 +38,7 @@ Public password recovery (`/api/auth/recovery/*` and `/recovery`) is disabled fo
 | External chat export | ~10/min/IP |
 | Per-user uploads | Separately limited |
 
-`/api/health` is excluded from the global ceiling.
+`/api/health` is excluded from the global ceiling. Note: per-IP rate limits still use the peer/forwarded address — configure trusted proxies when you need per-client fairness behind NAT.
 
 ## Uploads
 

frontend/package-lock.json

@@ -23,7 +23,7 @@
         "emoji-datasource-apple": "^15.1.2",
         "framer-motion": "^12.0.0",
         "lucide-react": "^0.468.0",
-        "next": "^15.1.0",
+        "next": "15.5.27",
         "next-themes": "^0.4.4",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
@@ -114,9 +114,9 @@
       }
     },
     "node_modules/@img/sharp-darwin-arm64": {
-      "version": "0.35.4",
+      "version": "0.35.5",
-      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.35.4.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.35.5.tgz",
-      "integrity": "sha512-Uhfl4V4lhP2nbUVF9+hyH1+luj86f1gUFeo8ALYxFoULoU+G87D43BfeMP8XHsk9boxAnCY/bf2EHwhA7MuGsA==",
+      "integrity": "sha512-QRUlFQ0WxvdWyqqG/WtI3iupfD5rBzmCHXSdPsY91sAtVtTo7Q4cb6zOccZ3gqEqkr0f1As1ehLqmEpDsRf+lg==",
       "cpu": [
         "arm64"
       ],
@@ -132,13 +132,13 @@
         "url": "https://opencollective.com/libvips"
       },
       "optionalDependencies": {
-        "@img/sharp-libvips-darwin-arm64": "1.3.3"
+        "@img/sharp-libvips-darwin-arm64": "1.3.4"
       }
     },
     "node_modules/@img/sharp-darwin-x64": {
-      "version": "0.35.4",
+      "version": "0.35.5",
-      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-x64/-/sharp-darwin-x64-0.35.4.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-x64/-/sharp-darwin-x64-0.35.5.tgz",
-      "integrity": "sha512-hWniXY3bG5qKpkKrAwPe4y+VTPmf086YQAnkxWh7uA1YrlRouWGa0M0Mxj3ZjnXFkv7/TD1bTy9lGUK26vRvWw==",
+      "integrity": "sha512-+BR255RhDlpygUpOc/Jdt1nT6DQ3XG/ERo5wbcdOf5Q320dKtPCKPLR1LJs9VGXRaMa8l1uUa0tkCNOXiAxZUw==",
       "cpu": [
         "x64"
       ],
@@ -154,20 +154,20 @@
         "url": "https://opencollective.com/libvips"
       },
       "optionalDependencies": {
-        "@img/sharp-libvips-darwin-x64": "1.3.3"
+        "@img/sharp-libvips-darwin-x64": "1.3.4"
       }
     },
     "node_modules/@img/sharp-freebsd-wasm32": {
-      "version": "0.35.4",
+      "version": "0.35.5",
-      "resolved": "https://registry.npmjs.org/@img/sharp-freebsd-wasm32/-/sharp-freebsd-wasm32-0.35.4.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-freebsd-wasm32/-/sharp-freebsd-wasm32-0.35.5.tgz",
-      "integrity": "sha512-lIsKw/BU+kjB4eZjxrYrZmwOJYi3Ajrv66iAlBmUPyKc3HpnloevB1g3wxGD9P/5BbQ1brBGl65VRRrCvQDEqA==",
+      "integrity": "sha512-Y/z91nEZ4uIBX5X3nfTovjU9lHNKFYbL2lpHCLVNmXQK03VIZvXBBt0KxbPGp2SdGSF+2mQU4e+hQaWOt86iAw==",
       "license": "Apache-2.0",
       "optional": true,
       "os": [
         "freebsd"
       ],
       "dependencies": {
-        "@img/sharp-wasm32": "0.35.4"
+        "@img/sharp-wasm32": "0.35.5"
       },
       "engines": {
         "node": ">=20.9.0"
@@ -177,9 +177,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-darwin-arm64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-arm64/-/sharp-libvips-darwin-arm64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-arm64/-/sharp-libvips-darwin-arm64-1.3.4.tgz",
-      "integrity": "sha512-suTBPTDGrI9WodccaDdwZItTSaBYASlBk1NSfElSHrUfzu3szG6lvIF58+WiFvnfzuK8ZBFS5zE00PxqxnRiPg==",
+      "integrity": "sha512-5R89nBYiRdUlSWJxPhO+GVtaXzXSxKnRu/xqMn3KTA3L9EB9Oy/P+Nn2f2vlhPuUdy/Zusb2DarbyTpGCfEDuw==",
       "cpu": [
         "arm64"
       ],
@@ -193,9 +193,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-darwin-x64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-x64/-/sharp-libvips-darwin-x64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-x64/-/sharp-libvips-darwin-x64-1.3.4.tgz",
-      "integrity": "sha512-FVJZ5mITMobmXIz/hPDTw0EintTW5H3WfrxwLqEqjiIihlu+hVRyGrFQ60xl0Lxn7Bt3zdpevPaQi0HEzqz9fw==",
+      "integrity": "sha512-iR2OKH80yi0U+dUplyh3/xdpFvps6YkCwsXenIJxqxR1v9o+xtKTGbS9H7cps+2Vxjc8B1j96p75NmTGjIhtpQ==",
       "cpu": [
         "x64"
       ],
@@ -209,9 +209,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-arm": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm/-/sharp-libvips-linux-arm-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm/-/sharp-libvips-linux-arm-1.3.4.tgz",
-      "integrity": "sha512-3rbU4vqXXc3hY/OiXdl52xZvT0F1yEngWfvqudtPJg/KkyiaQw2DRsFrNzpmLvfavbwOq3qXn36GP8obHRULQA==",
+      "integrity": "sha512-LmRtTsOHuvM2+wlO2Db37dx5MiZhB0FvSunciw48YjdOkZz9KAiRbm8ujeMOA1INqmei5NapFxYEK1D1ZSidmw==",
       "cpu": [
         "arm"
       ],
@@ -225,9 +225,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-arm64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm64/-/sharp-libvips-linux-arm64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm64/-/sharp-libvips-linux-arm64-1.3.4.tgz",
-      "integrity": "sha512-0DaL0A6Xu6sQSQFwe4iVCrKWU2cCTItnRsYsCdxAMm9NF6twAA9BKnoqy4hqz4+azQ0JHuA26qiUKsf1XJ/v5A==",
+      "integrity": "sha512-Y3dgX/6lE2QhQb+Gxy0WZxfg9MEm/JBjamZpS2IklP7xIQoKN4hzAm7KcMVGtaVDt3neE9OKBC7vAfonA/Lr1A==",
       "cpu": [
         "arm64"
       ],
@@ -241,9 +241,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-ppc64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-ppc64/-/sharp-libvips-linux-ppc64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-ppc64/-/sharp-libvips-linux-ppc64-1.3.4.tgz",
-      "integrity": "sha512-cdn1OvUBwsXhbC0zSzJnNzf5MZ/mTrobawDvNXBTxe8VtqKAm0sRuEY2Evzovb/w9JMk4TvRxqt1mekSuJz64w==",
+      "integrity": "sha512-Le6boB8Tai0Nis+gIxIpKx68UDVVIqdR8Tin5Yf1z2LJJQLDJvCDRqRu+jC2qCoD+eIomonmOwB4smBRxfVpYQ==",
       "cpu": [
         "ppc64"
       ],
@@ -257,9 +257,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-riscv64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-riscv64/-/sharp-libvips-linux-riscv64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-riscv64/-/sharp-libvips-linux-riscv64-1.3.4.tgz",
-      "integrity": "sha512-HjPVx7yKz+0lqdhDlTw1tt90wamBoxhiXpvl1XZpJLiHH4RCJ5yDTqH+VlYPv2fwFs89JFw4c1IexYOcQUi4IQ==",
+      "integrity": "sha512-aHkkIEHPRdQEegJN20MLmGtxYD9R2wQr3Cwpddnu5+YKMt6Uzax7S9h5gpZTo8wyrGuZSlfQ63OevL5mTyOC7Q==",
       "cpu": [
         "riscv64"
       ],
@@ -273,9 +273,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-s390x": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-s390x/-/sharp-libvips-linux-s390x-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-s390x/-/sharp-libvips-linux-s390x-1.3.4.tgz",
-      "integrity": "sha512-neWLh+3yCNThxnfy3c4BbVBeGgt9aftno+XbT56iK28RgeDs3UOFWviLWlUu0bArYVYJaFDK+RRohbicUNCm8Q==",
+      "integrity": "sha512-ra/mB6MikESDUO7Yg+Mi95bFBb9GsObURuhnOv3OqknjGe9sZrG8tCe9q0xSIGrtLgvgw0gKnFWcK4blSgQOuQ==",
       "cpu": [
         "s390x"
       ],
@@ -289,9 +289,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linux-x64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-x64/-/sharp-libvips-linux-x64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-x64/-/sharp-libvips-linux-x64-1.3.4.tgz",
-      "integrity": "sha512-4vKmvAst9nrowcqquKFAyZJUDolUaIp8uRiN0mWFguJ1IplC9/pitXtlnnlU4aa/eJw3J7i67V+pwUL+wZGdsA==",
+      "integrity": "sha512-GJ//SSXbnwSDes02umB3nDJLFcQzw8a18V8fyhqr6tV515tOEMdImjjxj1AoafMRz56F3PHgftnj1QEKSU1zkw==",
       "cpu": [
         "x64"
       ],
@@ -305,9 +305,9 @@
       }
     },
     "node_modules/@img/sharp-libvips-linuxmusl-arm64": {
-      "version": "1.3.3",
+      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linuxmusl-arm64/-/sharp-libvips-linuxmusl-arm64-1.3.3.tgz",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linuxmusl-arm64/-/sharp-libvips-linuxmusl-arm64-1.3.4.tgz",
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+      "integrity": "sha512-1MB9Rh5y8TOPN2x7naNTJNkCZQav9c70AI7EBYXxsEewwOffC4DjjwBwKf20NBvcA+u+5jDv7nVmHxunlP2d7Q==",
       "cpu": [
         "arm64"
       ],
@@ -773,9 +773,9 @@
       }
     },
     "node_modules/@next/swc-win32-x64-msvc": {
-      "version": "15.5.25",
+      "version": "15.5.27",
-      "resolved": "https://registry.npmjs.org/@next/swc-win32-x64-msvc/-/swc-win32-x64-msvc-15.5.25.tgz",
+      "resolved": "https://registry.npmjs.org/@next/swc-win32-x64-msvc/-/swc-win32-x64-msvc-15.5.27.tgz",
-      "integrity": "sha512-zREeykps3ndWr9egJgvJKqVkkDuaw6Zrrg23cYBos0ygydFkAWYU4+PaPVwXzP1eAYQJe53ShSK45iDM529BOg==",
+      "integrity": "sha512-XtYgpGOswgnyBWXzOEG6q9RhvnSw0CEZ0MbWqCsl5PISgt9EzvJvNW5mU5n1PsphX/lnamzxjgQXH2GUJL8nqg==",
       "cpu": [
         "x64"
       ],
@@ -2291,12 +2291,12 @@
       }
     },
     "node_modules/next": {
-      "version": "15.5.25",
+      "version": "15.5.27",
-      "resolved": "https://registry.npmjs.org/next/-/next-15.5.25.tgz",
+      "resolved": "https://registry.npmjs.org/next/-/next-15.5.27.tgz",
-      "integrity": "sha512-OMWNulIIqKM2ykvC2qMjIt0IoavB4UB2SCs4iXJ6z6847FvyH8jBmBWcvrF5iuhTu8Przh20Fo/aoszIdqx4PA==",
+      "integrity": "sha512-F82CrlPZ8GRxBH9RIIoR3qU1t5RT3dv1K8moe8SjlDEquiFipvEI13R1Om90TaUOEwShkWCMlg8+gvTNzfMhvg==",
       "license": "MIT",
       "dependencies": {
-        "@next/env": "15.5.25",
+        "@next/env": "15.5.27",
         "@swc/helpers": "0.5.15",
         "caniuse-lite": "^1.0.30001579",
         "postcss": "8.4.31",
@@ -2309,14 +2309,14 @@
         "node": "^18.18.0 || ^19.8.0 || >= 20.0.0"
       },
       "optionalDependencies": {
-        "@next/swc-darwin-arm64": "15.5.25",
+        "@next/swc-darwin-arm64": "15.5.27",
-        "@next/swc-darwin-x64": "15.5.25",
+        "@next/swc-darwin-x64": "15.5.27",
-        "@next/swc-linux-arm64-gnu": "15.5.25",
+        "@next/swc-linux-arm64-gnu": "15.5.27",
-        "@next/swc-linux-arm64-musl": "15.5.25",
+        "@next/swc-linux-arm64-musl": "15.5.27",
-        "@next/swc-linux-x64-gnu": "15.5.25",
+        "@next/swc-linux-x64-gnu": "15.5.27",
-        "@next/swc-linux-x64-musl": "15.5.25",
+        "@next/swc-linux-x64-musl": "15.5.27",
-        "@next/swc-win32-arm64-msvc": "15.5.25",
+        "@next/swc-win32-arm64-msvc": "15.5.27",
-        "@next/swc-win32-x64-msvc": "15.5.25",
+        "@next/swc-win32-x64-msvc": "15.5.27",
         "sharp": "^0.34.3 || ^0.35.4"
       },
       "peerDependencies": {
@@ -2352,34 +2352,6 @@
         "react-dom": "^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc"
       }
     },
-    "node_modules/next/node_modules/postcss": {
-      "version": "8.4.31",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
-      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/postcss/"
-        },
-        {
-          "type": "tidelift",
-          "url": "https://tidelift.com/funding/github/npm/postcss"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "nanoid": "^3.3.6",
-        "picocolors": "^1.0.0",
-        "source-map-js": "^1.0.2"
-      },
-      "engines": {
-        "node": "^10 || ^12 || >=14"
-      }
-    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
@@ -2390,7 +2362,6 @@
       "version": "8.5.28",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.28.tgz",
       "integrity": "sha512-RRuzqDtt5Y9h3quz5hWhK+TPnsmVs6WwSU6LkJMeY4HstUEDuYTG8UJSdawMRzmzAtV+KEoG8N3Qg2qLy5vM/A==",
-      "dev": true,
       "funding": [
         {
           "type": "opencollective",
@@ -2555,9 +2526,9 @@
       }
     },
     "node_modules/sharp": {
-      "version": "0.35.4",
+      "version": "0.35.5",
-      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.35.4.tgz",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.35.5.tgz",
-      "integrity": "sha512-n++8XWcj+jCOr2IOl7h8LbKnGBDY4aPbmprMONBNFdn0ImXqpGVv5zliDs0V9HbmbCQLpbuo2ej9rAoOQTvMDA==",
+      "integrity": "sha512-Ywn4OnzGukp7CDMrp08RQ50YKmuwG47brZgIVPTvBaaAfQlRlygrRqSrxdCiL9M+LlzLBiJ68IR1QqvzHyjC7g==",
       "license": "Apache-2.0",
       "optional": true,
       "dependencies": {
@@ -2572,31 +2543,31 @@
         "url": "https://opencollective.com/libvips"
       },
       "optionalDependencies": {
-        "@img/sharp-darwin-arm64": "0.35.4",
+        "@img/sharp-darwin-arm64": "0.35.5",
-        "@img/sharp-darwin-x64": "0.35.4",
+        "@img/sharp-darwin-x64": "0.35.5",
-        "@img/sharp-freebsd-wasm32": "0.35.4",
+        "@img/sharp-freebsd-wasm32": "0.35.5",
-        "@img/sharp-libvips-darwin-arm64": "1.3.3",
+        "@img/sharp-libvips-darwin-arm64": "1.3.4",
-        "@img/sharp-libvips-darwin-x64": "1.3.3",
+        "@img/sharp-libvips-darwin-x64": "1.3.4",
-        "@img/sharp-libvips-linux-arm": "1.3.3",
+        "@img/sharp-libvips-linux-arm": "1.3.4",
-        "@img/sharp-libvips-linux-arm64": "1.3.3",
+        "@img/sharp-libvips-linux-arm64": "1.3.4",
-        "@img/sharp-libvips-linux-ppc64": "1.3.3",
+        "@img/sharp-libvips-linux-ppc64": "1.3.4",
-        "@img/sharp-libvips-linux-riscv64": "1.3.3",
+        "@img/sharp-libvips-linux-riscv64": "1.3.4",
-        "@img/sharp-libvips-linux-s390x": "1.3.3",
+        "@img/sharp-libvips-linux-s390x": "1.3.4",
-        "@img/sharp-libvips-linux-x64": "1.3.3",
+        "@img/sharp-libvips-linux-x64": "1.3.4",
-        "@img/sharp-libvips-linuxmusl-arm64": "1.3.3",
+        "@img/sharp-libvips-linuxmusl-arm64": "1.3.4",
-        "@img/sharp-libvips-linuxmusl-x64": "1.3.3",
+        "@img/sharp-libvips-linuxmusl-x64": "1.3.4",
-        "@img/sharp-linux-arm": "0.35.4",
+        "@img/sharp-linux-arm": "0.35.5",
-        "@img/sharp-linux-arm64": "0.35.4",
+        "@img/sharp-linux-arm64": "0.35.5",
-        "@img/sharp-linux-ppc64": "0.35.4",
+        "@img/sharp-linux-ppc64": "0.35.5",
-        "@img/sharp-linux-riscv64": "0.35.4",
+        "@img/sharp-linux-riscv64": "0.35.5",
-        "@img/sharp-linux-s390x": "0.35.4",
+        "@img/sharp-linux-s390x": "0.35.5",
-        "@img/sharp-linux-x64": "0.35.4",
+        "@img/sharp-linux-x64": "0.35.5",
-        "@img/sharp-linuxmusl-arm64": "0.35.4",
+        "@img/sharp-linuxmusl-arm64": "0.35.5",
-        "@img/sharp-linuxmusl-x64": "0.35.4",
+        "@img/sharp-linuxmusl-x64": "0.35.5",
-        "@img/sharp-webcontainers-wasm32": "0.35.4",
+        "@img/sharp-webcontainers-wasm32": "0.35.5",
-        "@img/sharp-win32-arm64": "0.35.4",
+        "@img/sharp-win32-arm64": "0.35.5",
-        "@img/sharp-win32-ia32": "0.35.4",
+        "@img/sharp-win32-ia32": "0.35.5",
-        "@img/sharp-win32-x64": "0.35.4"
+        "@img/sharp-win32-x64": "0.35.5"
       },
       "peerDependenciesMeta": {
         "@types/node": {
@@ -2615,9 +2586,9 @@
       }
     },
     "node_modules/source-map-js": {
-      "version": "1.2.1",
+      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.2.tgz",
-      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "integrity": "sha512-KGj/8Y43x35aZVDtt+J4mK1hoLGHULMYfSkODJNQjNDC3oW1PqPoxMwo0pLUsWM/UEGzON/NxeHywEfNXNP3Vw==",
       "license": "BSD-3-Clause",
       "engines": {
         "node": ">=0.10.0"

frontend/package.json

@@ -27,7 +27,7 @@
     "emoji-datasource-apple": "^15.1.2",
     "framer-motion": "^12.0.0",
     "lucide-react": "^0.468.0",
-    "next": "^15.1.0",
+    "next": "15.5.27",
     "next-themes": "^0.4.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
@@ -44,5 +44,10 @@
     "@types/react-dom": "^19.0.0",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.7.0"
+  },
+  "overrides": {
+    "postcss": "8.5.28",
+    "sharp": "0.35.5",
+    "source-map-js": "1.2.2"
   }
 }

frontend/src/app/login/page.tsx

@@ -1,10 +1,10 @@
 "use client";
 
-import { useCallback, useEffect, useState } from "react";
+import { useState } from "react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { useQuery } from "@tanstack/react-query";
-import { CheckCircle2, Loader2, RefreshCw, ShieldCheck, Timer, Zap } from "lucide-react";
+import { CheckCircle2, Loader2, ShieldCheck, Timer, Zap } from "lucide-react";
 import { BrandMark } from "@/components/brand-mark";
 import { useAuth } from "@/lib/auth-store";
 import { http, toUserError } from "@/lib/api";
@@ -15,6 +15,7 @@ import { PasswordInput } from "@/components/ui/password-input";
 import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 import { CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
+import { CaptchaField, type CaptchaChallenge } from "@/components/captcha-field";
 
 const perks = [
   { icon: Timer, text: "زمان تماشای راستی‌آزمایی‌شده — بدون میان‌بر" },
@@ -22,11 +23,6 @@ const perks = [
   { icon: CheckCircle2, text: "لیگ هفتگی، رویداد زنده و منتور یک‌به‌یک" },
 ];
 
-type CaptchaChallenge = {
-  challengeId: string;
-  imageBase64: string;
-};
-
 export default function LoginPage() {
   const router = useRouter();
   const setSession = useAuth((s) => s.setSession);
@@ -34,7 +30,7 @@ export default function LoginPage() {
   const [password, setPassword] = useState("");
   const [captchaAnswer, setCaptchaAnswer] = useState("");
   const [challenge, setChallenge] = useState<CaptchaChallenge | null>(null);
-  const [captchaLoading, setCaptchaLoading] = useState(true);
+  const [captchaKey, setCaptchaKey] = useState(0);
   const [rememberMe, setRememberMe] = useState(false);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -44,29 +40,11 @@ export default function LoginPage() {
     queryFn: () => http.get<{ enabled: boolean }>("/api/auth/register-status"),
   });
 
-  const loadCaptcha = useCallback(async () => {
-    setCaptchaLoading(true);
-    setCaptchaAnswer("");
-    try {
-      const data = await http.get<CaptchaChallenge>("/api/auth/captcha");
-      setChallenge(data);
-    } catch (err) {
-      setChallenge(null);
-      setError(toUserError(err, "بارگذاری کد امنیتی ممکن نشد"));
-    } finally {
-      setCaptchaLoading(false);
-    }
-  }, []);
-
-  useEffect(() => {
-    void loadCaptcha();
-  }, [loadCaptcha]);
-
   const submit = async (e: React.FormEvent) => {
     e.preventDefault();
     if (!challenge) {
       setError("ابتدا کد امنیتی را بارگذاری کنید");
-      void loadCaptcha();
+      setCaptchaKey((k) => k + 1);
       return;
     }
     setLoading(true);
@@ -83,7 +61,7 @@ export default function LoginPage() {
       router.push("/cap");
     } catch (err) {
       setError(toUserError(err, "ورود ناموفق بود"));
-      void loadCaptcha();
+      setCaptchaKey((k) => k + 1);
     } finally {
       setLoading(false);
     }
@@ -153,54 +131,14 @@ export default function LoginPage() {
                   placeholder="رمز عبور"
                 />
               </div>
-              <div className="space-y-2">
+              <CaptchaField
-                <div className="flex items-center justify-between gap-2">
+                key={captchaKey}
-                  <Label htmlFor="captcha">کد امنیتی</Label>
+                id="captcha"
-                  <button
+                value={captchaAnswer}
-                    type="button"
+                onChange={setCaptchaAnswer}
-                    onClick={() => void loadCaptcha()}
+                onChallenge={setChallenge}
-                    disabled={captchaLoading}
+                onError={setError}
-                    className="inline-flex items-center gap-1 text-xs font-medium text-primary underline-offset-4 hover:underline disabled:opacity-50"
+              />
-                  >
-                    <RefreshCw className={`h-3.5 w-3.5 ${captchaLoading ? "animate-spin" : ""}`} />
-                    تازه‌سازی
-                  </button>
-                </div>
-                <div className="flex items-stretch gap-3">
-                  <div
-                    className="relative flex h-14 min-w-[9.5rem] shrink-0 items-center justify-center overflow-hidden rounded-xl border border-border bg-muted/60 shadow-inner"
-                    aria-live="polite"
-                  >
-                    {captchaLoading || !challenge?.imageBase64 ? (
-                      <span className="text-sm text-muted-foreground">…</span>
-                    ) : (
-                      // eslint-disable-next-line @next/next/no-img-element
-                      <img
-                        src={`data:image/png;base64,${challenge.imageBase64}`}
-                        alt="کد امنیتی"
-                        width={160}
-                        height={52}
-                        className="h-full w-full object-contain select-none"
-                        draggable={false}
-                      />
-                    )}
-                  </div>
-                  <Input
-                    id="captcha"
-                    type="text"
-                    autoComplete="off"
-                    autoCapitalize="characters"
-                    spellCheck={false}
-                    value={captchaAnswer}
-                    onChange={(e) => setCaptchaAnswer(e.target.value.toUpperCase())}
-                    required
-                    dir="ltr"
-                    className="h-14 text-center font-mono tracking-widest uppercase placeholder:text-center"
-                    placeholder="کد تصویر"
-                    maxLength={6}
-                  />
-                </div>
-              </div>
               <label className="flex items-center justify-between gap-3 text-sm">
                 <span>مرا به یاد داشته باش</span>
                 <Switch
@@ -215,7 +153,7 @@ export default function LoginPage() {
                 variant="gradient"
                 className="h-12 w-full"
                 size="lg"
-                disabled={loading || captchaLoading || !challenge}
+                disabled={loading || !challenge}
               >
                 {loading ? <Loader2 className="h-4 w-4 animate-spin" /> : <Zap className="h-4 w-4" />} ورود
               </Button>

frontend/src/app/profile/[id]/page.tsx

@@ -0,0 +1,130 @@
+"use client";
+
+import type { ReactNode } from "react";
+import dynamic from "next/dynamic";
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { useQuery } from "@tanstack/react-query";
+import { Flame, Heart, Sparkles, User as UserIcon } from "lucide-react";
+import { http, toUserError } from "@/lib/api";
+import { useAuth } from "@/lib/auth-store";
+import type { PublicProfile } from "@/lib/types";
+import { Panel } from "@/components/panel";
+import { Button } from "@/components/ui/button";
+import { Skeleton } from "@/components/ui/skeleton";
+import { UserAvatar, avatarPropsOf } from "@/components/ui/user-avatar";
+import { formatFaNumber, formatStreakLabel } from "@/lib/utils";
+
+const AdminProfileManage = dynamic(
+  () => import("@/components/admin/profile-manage").then((m) => m.AdminProfileManage),
+  { ssr: false },
+);
+
+function roleLabel(role: string) {
+  if (role === "mentor") return "منتور";
+  if (role === "admin") return "ادمین";
+  return "هنرجو";
+}
+
+export default function PublicProfilePage() {
+  const params = useParams<{ id: string }>();
+  const id = Number(params.id);
+  const enabled = Number.isFinite(id) && id > 0;
+  const isAdmin = useAuth((s) => s.user?.role === "admin");
+
+  const profileQ = useQuery({
+    queryKey: ["public-profile", id],
+    queryFn: () => http.get<{ user: PublicProfile }>(`/api/users/${id}`),
+    enabled,
+    retry: 1,
+  });
+
+  if (!enabled) {
+    return (
+      <div className="mx-auto max-w-2xl py-16 text-center text-sm text-muted-foreground">
+        کاربر پیدا نشد.
+      </div>
+    );
+  }
+
+  if (profileQ.isPending) {
+    return (
+      <div className="mx-auto max-w-2xl space-y-4" aria-busy="true" aria-label="در حال بارگذاری پروفایل">
+        <Skeleton className="h-40 rounded-2xl" />
+        <div className="grid gap-3 sm:grid-cols-2">
+          {[0, 1, 2, 3].map((i) => (
+            <Skeleton key={i} className="h-20 rounded-2xl" />
+          ))}
+        </div>
+      </div>
+    );
+  }
+
+  if (profileQ.isError || !profileQ.data?.user) {
+    return (
+      <div className="mx-auto max-w-2xl space-y-4 py-16 text-center">
+        <p className="text-sm font-bold text-destructive">
+          {toUserError(profileQ.error, "کاربر پیدا نشد")}
+        </p>
+        <Button asChild variant="outline">
+          <Link href="/unwrap">بازگشت</Link>
+        </Button>
+      </div>
+    );
+  }
+
+  const person = profileQ.data.user;
+
+  return (
+    <div className="mx-auto max-w-2xl space-y-6">
+      <Panel
+        title={person.name}
+        description={roleLabel(person.role)}
+        icon={<UserIcon className="h-5 w-5" />}
+        tint="bg-primary/10 text-primary"
+      >
+        <div className="flex flex-col items-center gap-4 sm:flex-row sm:items-start">
+          <UserAvatar name={person.name} className="h-20 w-20" {...avatarPropsOf(person)} />
+          <div className="min-w-0 flex-1 space-y-2 text-center sm:text-start">
+            <h1 className="text-2xl font-black tracking-tight">{person.name}</h1>
+            <p className="font-latin text-sm font-bold" dir="ltr">
+              @{person.username}
+            </p>
+            {person.isLocked && (
+              <p className="text-xs font-bold text-destructive">حساب قفل است</p>
+            )}
+          </div>
+        </div>
+      </Panel>
+
+      <div className="grid gap-3 sm:grid-cols-2">
+        <Stat icon={<Sparkles className="h-4 w-4 text-gold" />} label="امتیاز" value={formatFaNumber(person.xp)} />
+        <Stat icon={<Heart className="h-4 w-4 text-destructive" />} label="قلب‌ها" value={formatFaNumber(person.hearts)} />
+        <Stat
+          icon={<Flame className="h-4 w-4 text-accent" />}
+          label="زنجیرهٔ فعلی"
+          value={formatStreakLabel(person.streakCurrent)}
+        />
+        <Stat
+          icon={<Flame className="h-4 w-4 text-muted-foreground" />}
+          label="بلندترین زنجیره"
+          value={formatStreakLabel(person.streakLongest)}
+        />
+      </div>
+
+      {isAdmin && <AdminProfileManage userId={person.id} />}
+    </div>
+  );
+}
+
+function Stat({ icon, label, value }: { icon: ReactNode; label: string; value: string }) {
+  return (
+    <div className="flex items-center gap-3 rounded-2xl border border-border bg-card px-4 py-3">
+      {icon}
+      <div>
+        <p className="text-[11px] font-bold text-muted-foreground">{label}</p>
+        <p className="text-lg font-black tabular-nums">{value}</p>
+      </div>
+    </div>
+  );
+}

frontend/src/components/admin-studio.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useQuery, useQueryClient } from "@tanstack/react-query";
+import Link from "next/link";
 import { useRouter, useSearchParams, usePathname } from "next/navigation";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import {
@@ -16,7 +17,6 @@ import {
   Globe,
   GripVertical,
   Heart,
-  KeyRound,
   Layers,
   Loader2,
   Lock,
@@ -454,6 +454,10 @@ function UsersPanel() {
                 (currentUser?.role === "mentor" && u.role === "student");
               return (
               <div key={u.id} className="flex items-center gap-3 px-3 py-2.5">
+                <Link
+                  href={`/profile/${u.id}`}
+                  className="flex min-w-0 flex-1 items-center gap-3 rounded-md outline-none hover:text-primary focus-visible:ring-2 focus-visible:ring-ring"
+                >
                 <UserAvatar name={u.name} className="h-9 w-9" {...avatarPropsOf(u)} />
                 <div className="min-w-0 flex-1">
                   <p className="flex items-center gap-2 truncate text-sm font-medium">
@@ -475,6 +479,7 @@ function UsersPanel() {
                     {u.role === "admin" || u.role === "mentor" ? "∞" : formatFaNumber(u.hearts)}
                   </span>
                 </div>
+                </Link>
                 <div className="flex shrink-0 gap-1.5">
                   {canMutate && u.id !== currentUser?.id && (
                     u.isLocked ? (
@@ -515,7 +520,7 @@ function UsersPanel() {
   );
 }
 
-function UserDialog({
+export function UserDialog({
   user,
   onClose,
   onSaved,
@@ -529,18 +534,13 @@ function UserDialog({
   const [form, setForm] = useState<User>(user ?? ({} as User));
   const [password, setPassword] = useState("");
   const [securityAnswer, setSecurityAnswer] = useState("");
-  const [resetAnswer, setResetAnswer] = useState("");
-  const [resetPassword, setResetPassword] = useState("");
   const [saving, setSaving] = useState(false);
-  const [resetting, setResetting] = useState(false);
 
   useEffect(() => {
     if (user) {
       setForm(user);
       setPassword("");
       setSecurityAnswer("");
-      setResetAnswer("");
-      setResetPassword("");
     }
   }, [user]);
 
@@ -633,29 +633,6 @@ function UserDialog({
     }
   };
 
-  const doReset = async () => {
-    if (!form?.id) return;
-    const pwErr = validatePassword(resetPassword);
-    if (!resetAnswer.trim() || pwErr) {
-      toast.error(pwErr ?? "جواب امنیتی و رمز جدید (حداقل ۸ کاراکتر) لازم است");
-      return;
-    }
-    setResetting(true);
-    try {
-      await http.post(`/api/admin/users/${form.id}/reset-password`, {
-        securityAnswer: resetAnswer,
-        newPassword: resetPassword,
-      });
-      toast.success("رمز عبور ریست شد");
-      setResetAnswer("");
-      setResetPassword("");
-    } catch (e) {
-      toast.error(toUserError(e));
-    } finally {
-      setResetting(false);
-    }
-  };
-
   return (
     <Dialog open={!!user} onOpenChange={(o) => !o && onClose()}>
       <DialogContent className="max-h-[90vh] overflow-y-auto">
@@ -664,7 +641,7 @@ function UserDialog({
           <DialogDescription>
             {isNew
               ? "حساب جدید با تلفن و سوال امنیتی. رمز حداقل ۸ کاراکتر."
-              : "اطلاعات کاربر را به‌روزرسانی کنید. ریست رمز فقط با جواب امنیتی."}
+              : "اطلاعات کاربر را به‌روزرسانی کنید."}
           </DialogDescription>
         </DialogHeader>
         <div className="grid gap-3">
@@ -768,40 +745,6 @@ function UserDialog({
               />
             </div>
           )}
-          {!isNew && (
-            <div className="space-y-2 rounded-md border border-dashed border-border p-3">
-              <p className="text-sm font-medium">ریست رمز با سوال امنیتی</p>
-              {form.securityQuestion ? (
-                <p className="text-xs text-muted-foreground">سوال: {form.securityQuestion}</p>
-              ) : (
-                <p className="text-xs text-destructive">سوال امنیتی تعریف نشده است.</p>
-              )}
-              <PasswordInput
-                value={resetAnswer}
-                onChange={(e) => setResetAnswer(e.target.value)}
-                placeholder="جواب امنیتی"
-                dir="rtl"
-                autoComplete="off"
-              />
-              <PasswordInput
-                value={resetPassword}
-                onChange={(e) => setResetPassword(e.target.value)}
-                placeholder="رمز جدید (حداقل ۸ کاراکتر)"
-                minLength={8}
-                autoComplete="new-password"
-              />
-              <Button
-                type="button"
-                variant="outline"
-                size="sm"
-                disabled={resetting || !form.hasSecurityAnswer}
-                onClick={doReset}
-              >
-                {resetting ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <KeyRound className="h-3.5 w-3.5" />}
-                ریست رمز
-              </Button>
-            </div>
-          )}
         </div>
         <DialogFooter>
           <Button variant="outline" onClick={onClose}>انصراف</Button>

frontend/src/components/admin/invites-panel.tsx

@@ -68,16 +68,18 @@ export function InvitesPanel() {
   const [editBusy, setEditBusy] = useState(false);
   const [page, setPage] = useState(1);
   const [q, setQ] = useState("");
+  const [status, setStatus] = useState<"" | RegistrationInvite["status"]>("");
 
   useEffect(() => {
     setPage(1);
-  }, [q]);
+  }, [q, status]);
 
   const { data, isLoading } = useQuery({
-    queryKey: ["admin", "invites", q, page],
+    queryKey: ["admin", "invites", q, status, page],
     queryFn: () => {
       const params = new URLSearchParams(buildPageQuery(page));
       if (q.trim()) params.set("q", q.trim());
+      if (status) params.set("status", status);
       return http.get<Paginated<RegistrationInvite>>(`/api/admin/invites?${params.toString()}`);
     },
   });
@@ -296,14 +298,43 @@ export function InvitesPanel() {
         </CardHeader>
         <CardContent className="space-y-4">
           <ListToolbar>
+            <div className="flex flex-wrap items-center gap-2">
+              {(
+                [
+                  ["", "همه"],
+                  ["active", "فعال"],
+                  ["paused", "متوقف"],
+                  ["exhausted", "تکمیل‌شده"],
+                  ["revoked", "لغو شده"],
+                ] as const
+              ).map(([value, label]) => (
+                <Button
+                  key={value || "all"}
+                  type="button"
+                  size="sm"
+                  variant={status === value ? "default" : "outline"}
+                  onClick={() => setStatus(value)}
+                >
+                  {label}
+                </Button>
+              ))}
+            </div>
             <Input
               placeholder="جستجو با برچسب…"
               value={q}
               onChange={(e) => setQ(e.target.value)}
               className="max-w-xs"
             />
-            {q && (
+            {(q || status) && (
-              <Button type="button" size="sm" variant="ghost" onClick={() => setQ("")}>
+              <Button
+                type="button"
+                size="sm"
+                variant="ghost"
+                onClick={() => {
+                  setQ("");
+                  setStatus("");
+                }}
+              >
                 پاک کردن
               </Button>
             )}
@@ -315,7 +346,7 @@ export function InvitesPanel() {
           )}
           {!isLoading && invites.length === 0 && (
             <p className="py-6 text-center text-sm text-muted-foreground">
-              {q.trim() ? "نتیجه‌ای یافت نشد." : "هنوز لینک عضویتی ساخته نشده است."}
+              {q.trim() || status ? "نتیجه‌ای یافت نشد." : "هنوز لینک عضویتی ساخته نشده است."}
             </p>
           )}
           <div className="space-y-2">

frontend/src/components/admin/learning-panel.tsx

@@ -1,7 +1,7 @@
 "use client";
 
-import { useMemo, useState } from "react";
+import { useEffect, useState } from "react";
-import { useQuery, useQueryClient } from "@tanstack/react-query";
+import { keepPreviousData, useQuery, useQueryClient } from "@tanstack/react-query";
 import {
   AlertTriangle,
   Flame,
@@ -34,6 +34,12 @@ import {
 } from "@/components/ui/dialog";
 import { toast } from "@/components/providers";
 import { cn, formatFaNumber } from "@/lib/utils";
+import {
+  DEFAULT_PAGE_SIZE,
+  ListPagination,
+  buildPageQuery,
+  type Paginated,
+} from "@/components/admin/list-pagination";
 
 type SortKey = "xp" | "progress" | "activity" | "streak";
 type FilterKey = "all" | "active" | "locked";
@@ -58,6 +64,11 @@ export function LearningPanel() {
   const [sort, setSort] = useState<SortKey>("xp");
   const [selectedId, setSelectedId] = useState<number | null>(null);
   const [unlocking, setUnlocking] = useState(false);
+  const [page, setPage] = useState(1);
+
+  useEffect(() => {
+    setPage(1);
+  }, [q, filter, sort]);
 
   const overviewQ = useQuery({
     queryKey: ["admin", "learning", "overview"],
@@ -66,11 +77,17 @@ export function LearningPanel() {
   });
 
   const studentsQ = useQuery({
-    queryKey: ["admin", "learning", "students", q],
+    queryKey: ["admin", "learning", "students", q, filter, sort, page],
-    queryFn: () =>
+    queryFn: () => {
-      http.get<{ students: StudentLearningRow[] }>(
+      const params = new URLSearchParams(buildPageQuery(page));
-        `/api/admin/learning/students?q=${encodeURIComponent(q)}`
+      if (q.trim()) params.set("q", q.trim());
-      ),
+      if (filter !== "all") params.set("filter", filter);
+      params.set("sort", sort);
+      return http.get<Paginated<StudentLearningRow>>(
+        `/api/admin/learning/students?${params.toString()}`,
+      );
+    },
+    placeholderData: keepPreviousData,
     retry: 1,
   });
 
@@ -98,27 +115,9 @@ export function LearningPanel() {
   };
 
   const overview = overviewQ.data?.overview;
-  const students = useMemo(() => {
+  const students = studentsQ.data?.items ?? [];
-    let rows = [...(studentsQ.data?.students ?? [])];
+  const studentsTotal = studentsQ.data?.total ?? 0;
-    if (filter === "active") rows = rows.filter((r) => r.isActive && !r.isLocked);
+  const studentsPageSize = studentsQ.data?.pageSize ?? DEFAULT_PAGE_SIZE;
-    if (filter === "locked") rows = rows.filter((r) => r.isLocked);
-    rows.sort((a, b) => {
-      switch (sort) {
-        case "progress":
-          return b.progressPct - a.progressPct;
-        case "streak":
-          return b.streakCurrent - a.streakCurrent;
-        case "activity": {
-          const at = a.lastActivityAt ? new Date(a.lastActivityAt).getTime() : 0;
-          const bt = b.lastActivityAt ? new Date(b.lastActivityAt).getTime() : 0;
-          return bt - at;
-        }
-        default:
-          return b.xp - a.xp;
-      }
-    });
-    return rows;
-  }, [studentsQ.data?.students, filter, sort]);
 
   const cards = overview
     ? [
@@ -177,7 +176,7 @@ export function LearningPanel() {
           <div>
             <CardTitle className="text-base">جدول هنرجویان</CardTitle>
             <p className="mt-1 text-xs text-muted-foreground">
-              {formatFaNumber(students.length)} نفر · برای جزئیات روی ردیف بزنید
+              {formatFaNumber(studentsTotal)} نفر · برای جزئیات روی ردیف بزنید
             </p>
           </div>
           <div className="flex flex-wrap items-center gap-2">
@@ -295,6 +294,12 @@ export function LearningPanel() {
               <p className="py-10 text-center text-sm text-muted-foreground">هنرجویی یافت نشد.</p>
             )}
           </div>
+          <ListPagination
+            page={page}
+            pageSize={studentsPageSize}
+            total={studentsTotal}
+            onPageChange={setPage}
+          />
         </CardContent>
       </Card>
 
@@ -305,9 +310,11 @@ export function LearningPanel() {
               {detailQ.data?.learning.user.name ?? "جزئیات یادگیری"}
             </DialogTitle>
             <DialogDescription>
-              {detailQ.data
+              {detailQ.isError
-                ? `@${detailQ.data.learning.user.username} · ${pct(detailQ.data.learning.user.progressPct)} مسیر`
+                ? toUserError(detailQ.error, "بارگذاری جزئیات ممکن نشد")
-                : "در حال بارگذاری…"}
+                : detailQ.data
+                  ? `@${detailQ.data.learning.user.username} · ${pct(detailQ.data.learning.user.progressPct)} مسیر`
+                  : "در حال بارگذاری…"}
             </DialogDescription>
           </DialogHeader>
           <div className="space-y-5 px-6 py-5">

frontend/src/components/admin/physical-orders-panel.tsx

@@ -1,7 +1,7 @@
 "use client";
 
-import { useQuery, useQueryClient } from "@tanstack/react-query";
+import { keepPreviousData, useQuery, useQueryClient } from "@tanstack/react-query";
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import { Loader2 } from "lucide-react";
 import { http, toUserError } from "@/lib/api";
 import type { CertificatePhysicalOrder, PhysicalCertSettings, PhysicalOrderStatus } from "@/lib/types";
@@ -11,6 +11,11 @@ import { Badge } from "@/components/ui/badge";
 import { Input } from "@/components/ui/input";
 import { toast } from "@/components/providers";
 import { formatFaNumber } from "@/lib/utils";
+import {
+  DEFAULT_PAGE_SIZE,
+  ListPagination,
+  buildPageQuery,
+} from "@/components/admin/list-pagination";
 
 const STATUS_LABEL: Record<PhysicalOrderStatus, string> = {
   requested: "درخواست‌شده",
@@ -27,16 +32,29 @@ const NEXT: Partial<Record<PhysicalOrderStatus, PhysicalOrderStatus>> = {
 export function PhysicalOrdersPanel() {
   const qc = useQueryClient();
   const [statusFilter, setStatusFilter] = useState("");
+  const [page, setPage] = useState(1);
   const [notes, setNotes] = useState<Record<number, string>>({});
   const [tracking, setTracking] = useState<Record<number, string>>({});
   const [busy, setBusy] = useState<number | null>(null);
 
+  useEffect(() => {
+    setPage(1);
+  }, [statusFilter]);
+
   const { data, isLoading } = useQuery({
-    queryKey: ["admin", "physical-orders", statusFilter],
+    queryKey: ["admin", "physical-orders", statusFilter, page],
-    queryFn: () =>
+    queryFn: () => {
-      http.get<{ orders: CertificatePhysicalOrder[]; physical: PhysicalCertSettings }>(
+      const params = new URLSearchParams(buildPageQuery(page));
-        `/api/admin/physical-orders?status=${encodeURIComponent(statusFilter)}`,
+      if (statusFilter) params.set("status", statusFilter);
-      ),
+      return http.get<{
+        orders: CertificatePhysicalOrder[];
+        physical: PhysicalCertSettings;
+        total: number;
+        page: number;
+        pageSize: number;
+      }>(`/api/admin/physical-orders?${params.toString()}`);
+    },
+    placeholderData: keepPreviousData,
   });
 
   const update = async (id: number, status: PhysicalOrderStatus) => {
@@ -151,6 +169,12 @@ export function PhysicalOrdersPanel() {
         {!isLoading && (data?.orders ?? []).length === 0 && (
           <p className="py-8 text-center text-sm text-muted-foreground">سفارشی نیست.</p>
         )}
+        <ListPagination
+          page={page}
+          pageSize={data?.pageSize ?? DEFAULT_PAGE_SIZE}
+          total={data?.total ?? 0}
+          onPageChange={setPage}
+        />
       </CardContent>
     </Card>
   );

frontend/src/components/admin/profile-manage.tsx

@@ -0,0 +1,245 @@
+"use client";
+
+import { useState, type ReactNode } from "react";
+import { useRouter } from "next/navigation";
+import { useQuery, useQueryClient } from "@tanstack/react-query";
+import { KeyRound, Loader2, Lock, Mail, Pencil, Phone, Shield, ShieldQuestion, Trash2, Unlock } from "lucide-react";
+import { UserDialog } from "@/components/admin-studio";
+import { useConfirm } from "@/components/admin/use-confirm";
+import { Panel } from "@/components/panel";
+import { toast } from "@/components/providers";
+import { Button } from "@/components/ui/button";
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
+import { Label } from "@/components/ui/label";
+import { PasswordInput } from "@/components/ui/password-input";
+import { Skeleton } from "@/components/ui/skeleton";
+import { http, toUserError } from "@/lib/api";
+import { useAuth } from "@/lib/auth-store";
+import { validatePassword } from "@/lib/validation";
+import { cn } from "@/lib/utils";
+import type { User } from "@/lib/types";
+
+export function AdminProfileManage({ userId }: { userId: number }) {
+  const me = useAuth((s) => s.user);
+  const router = useRouter();
+  const qc = useQueryClient();
+  const { confirm, dialog } = useConfirm();
+  const [busy, setBusy] = useState<"lock" | "delete" | "reset" | null>(null);
+  const [editing, setEditing] = useState<User | null>(null);
+  const [resetOpen, setResetOpen] = useState(false);
+  const [nextPassword, setNextPassword] = useState("");
+  const [confirmPassword, setConfirmPassword] = useState("");
+
+  const accountQ = useQuery({
+    queryKey: ["admin", "user", userId],
+    queryFn: () => http.get<{ user: User }>(`/api/admin/users/${userId}`),
+    retry: 1,
+  });
+
+  const refresh = () => {
+    qc.invalidateQueries({ queryKey: ["admin", "user", userId] });
+    qc.invalidateQueries({ queryKey: ["public-profile", userId] });
+    qc.invalidateQueries({ queryKey: ["admin", "users"] });
+    qc.invalidateQueries({ queryKey: ["admin", "stats"] });
+  };
+
+  const account = accountQ.data?.user;
+  const isSelf = account?.id === me?.id;
+
+  const act = async (kind: "lock" | "unlock") => {
+    setBusy("lock");
+    try {
+      await http.post(`/api/admin/users/${userId}/${kind}`);
+      toast.success(kind === "lock" ? "حساب قفل شد" : "حساب فعال شد");
+      refresh();
+    } catch (e) {
+      toast.error(toUserError(e));
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  const closeReset = () => {
+    setResetOpen(false);
+    setNextPassword("");
+    setConfirmPassword("");
+  };
+
+  const resetPassword = async () => {
+    const pwErr = validatePassword(nextPassword, confirmPassword);
+    if (pwErr) {
+      toast.error(pwErr);
+      return;
+    }
+    setBusy("reset");
+    try {
+      await http.post(`/api/admin/users/${userId}/reset-password`, { newPassword: nextPassword });
+      toast.success("رمز عبور عوض شد");
+      closeReset();
+    } catch (e) {
+      toast.error(toUserError(e));
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  const del = async () => {
+    if (!account) {
+      return;
+    }
+    if (
+      !(await confirm(
+        "حذف کاربر",
+        `حساب «${account.name}» (${account.email}) برای همیشه حذف شود؟ این عمل بازگشت‌ناپذیر است.`,
+      ))
+    ) {
+      return;
+    }
+    setBusy("delete");
+    try {
+      await http.del(`/api/admin/users/${account.id}`);
+      toast.success("کاربر حذف شد");
+      router.push("/admin?tab=users");
+    } catch (e) {
+      toast.error(toUserError(e));
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  return (
+    <>
+      {dialog}
+      <Panel
+        title="مدیریت حساب"
+        description="فقط ادمین این بخش را می‌بیند."
+        icon={<Shield className="h-5 w-5" />}
+        tint="bg-destructive/10 text-destructive"
+      >
+        {accountQ.isPending && (
+          <div className="space-y-2" aria-busy="true">
+            <Skeleton className="h-4 w-2/3" />
+            <Skeleton className="h-4 w-1/2" />
+            <Skeleton className="h-9 w-full" />
+          </div>
+        )}
+        {accountQ.isError && (
+          <p className="text-sm font-bold text-destructive">{toUserError(accountQ.error, "حساب پیدا نشد")}</p>
+        )}
+        {account && (
+          <div className="space-y-4">
+            <dl className="grid gap-3 sm:grid-cols-2">
+              <AccountFact icon={<Mail className="h-3.5 w-3.5" />} label="ایمیل" value={account.email} ltr />
+              <AccountFact
+                icon={<Phone className="h-3.5 w-3.5" />}
+                label="تلفن"
+                value={account.phone || "ثبت نشده"}
+                ltr
+              />
+              <AccountFact
+                className="sm:col-span-2"
+                icon={<ShieldQuestion className="h-3.5 w-3.5" />}
+                label="سوال امنیتی"
+                value={account.securityQuestion || "تعریف نشده"}
+              />
+            </dl>
+            <div className="space-y-2 border-t border-border/70 pt-4">
+              {!isSelf &&
+                (account.isLocked ? (
+                  <Button size="sm" variant="success" disabled={busy !== null} onClick={() => act("unlock")}>
+                    {busy === "lock" ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Unlock className="h-3.5 w-3.5" />}
+                    فعال‌سازی
+                  </Button>
+                ) : (
+                  <Button size="sm" variant="outline" disabled={busy !== null} onClick={() => act("lock")}>
+                    {busy === "lock" ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Lock className="h-3.5 w-3.5" />}
+                    قفل
+                  </Button>
+                ))}
+              <div className={cn("grid gap-2", isSelf ? "sm:grid-cols-2" : "sm:grid-cols-3")}>
+                <Button size="sm" variant="outline" className="w-full" onClick={() => setEditing(account)}>
+                  <Pencil className="h-3.5 w-3.5" /> ویرایش
+                </Button>
+                <Button size="sm" variant="outline" className="w-full" disabled={busy !== null} onClick={() => setResetOpen(true)}>
+                  <KeyRound className="h-3.5 w-3.5" /> ریست رمز
+                </Button>
+                {!isSelf && (
+                  <Button size="sm" variant="destructive" className="w-full" disabled={busy !== null} onClick={del}>
+                    {busy === "delete" ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Trash2 className="h-3.5 w-3.5" />}
+                    حذف
+                  </Button>
+                )}
+              </div>
+            </div>
+          </div>
+        )}
+      </Panel>
+      <UserDialog user={editing} onClose={() => setEditing(null)} onSaved={refresh} />
+      <Dialog open={resetOpen} onOpenChange={(open) => !open && closeReset()}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>ریست رمز</DialogTitle>
+            <DialogDescription>رمز جدید همین حساب را بنویسید.</DialogDescription>
+          </DialogHeader>
+          <div className="grid gap-3">
+            <div className="space-y-1.5">
+              <Label htmlFor="reset-password">رمز جدید</Label>
+              <PasswordInput
+                id="reset-password"
+                value={nextPassword}
+                onChange={(e) => setNextPassword(e.target.value)}
+                autoComplete="new-password"
+                placeholder="حداقل ۸ کاراکتر"
+              />
+            </div>
+            <div className="space-y-1.5">
+              <Label htmlFor="reset-password-confirm">تکرار رمز</Label>
+              <PasswordInput
+                id="reset-password-confirm"
+                value={confirmPassword}
+                onChange={(e) => setConfirmPassword(e.target.value)}
+                autoComplete="new-password"
+                placeholder="همان رمز را دوباره بنویسید"
+              />
+            </div>
+          </div>
+          <DialogFooter className="gap-2">
+            <Button variant="outline" onClick={closeReset}>
+              انصراف
+            </Button>
+            <Button onClick={() => void resetPassword()} disabled={busy === "reset"}>
+              {busy === "reset" ? <Loader2 className="h-4 w-4 animate-spin" /> : <KeyRound className="h-4 w-4" />}
+              ذخیره رمز
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </>
+  );
+}
+
+function AccountFact({
+  icon,
+  label,
+  value,
+  ltr,
+  className,
+}: {
+  icon: ReactNode;
+  label: string;
+  value: string;
+  ltr?: boolean;
+  className?: string;
+}) {
+  return (
+    <div className={cn("rounded-xl border border-border/80 bg-muted/25 px-3.5 py-3", className)}>
+      <dt className="flex items-center gap-1.5 text-[11px] font-bold text-muted-foreground">
+        {icon}
+        {label}
+      </dt>
+      <dd className={cn("mt-1.5 text-sm font-semibold leading-relaxed [overflow-wrap:anywhere]", ltr && "font-latin")} dir={ltr ? "ltr" : undefined}>
+        {value}
+      </dd>
+    </div>
+  );
+}

frontend/src/components/admin/stats-panel.tsx

@@ -142,7 +142,7 @@ export function StatsPanel() {
 
   const s = data?.stats;
   const cards = [
-    { label: "هنرجویان", value: s?.users ?? 0, icon: Users, klass: "text-primary bg-primary/10", hint: "حساب‌های فعال در سامانه" },
+    { label: "هنرجویان", value: s?.users ?? 0, icon: Users, klass: "text-primary bg-primary/10", hint: "هنرجویان با حساب فعال" },
     { label: "درس‌ها", value: s?.lessons ?? 0, icon: BookOpen, klass: "text-secondary bg-secondary/10", hint: "درس‌های ثبت‌شده در درخت" },
     { label: "سوالات", value: s?.questions ?? 0, icon: Activity, klass: "text-accent bg-accent/10", hint: "بانک سوالات آزمون" },
     { label: "رویدادها", value: s?.events ?? 0, icon: CalendarPlus, klass: "text-gold bg-gold/10", hint: "جلسات و کارگاه‌ها" },

frontend/src/components/app-shell.tsx

@@ -24,6 +24,7 @@ const PROTECTED_PREFIXES = [
   "/quiz",
   "/notifications",
   "/lockout",
+  "/profile",
 ];
 
 function needsAuth(p: string) {

frontend/src/components/captcha-field.tsx

@@ -0,0 +1,155 @@
+"use client";
+
+import { useCallback, useEffect, useRef, useState } from "react";
+import { RefreshCw } from "lucide-react";
+import { http, toUserError } from "@/lib/api";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+
+export type CaptchaChallenge = {
+  challengeId: string;
+  imageBase64: string;
+  expiresIn?: number;
+};
+
+const FALLBACK_SECONDS = 120;
+
+export function CaptchaField({
+  id,
+  value,
+  onChange,
+  onChallenge,
+  onError,
+}: {
+  id: string;
+  value: string;
+  onChange: (value: string) => void;
+  onChallenge: (challenge: CaptchaChallenge | null) => void;
+  onError?: (message: string | null) => void;
+}) {
+  const [challenge, setChallenge] = useState<CaptchaChallenge | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [left, setLeft] = useState(FALLBACK_SECONDS);
+  const gen = useRef(0);
+  const rotating = useRef(false);
+  const onChallengeRef = useRef(onChallenge);
+  const onChangeRef = useRef(onChange);
+  const onErrorRef = useRef(onError);
+  onChallengeRef.current = onChallenge;
+  onChangeRef.current = onChange;
+  onErrorRef.current = onError;
+
+  const load = useCallback(async (silent: boolean) => {
+    if (silent && rotating.current) return;
+    if (silent) rotating.current = true;
+    const ticket = ++gen.current;
+    if (!silent) setLoading(true);
+    try {
+      const data = await http.get<CaptchaChallenge>("/api/auth/captcha");
+      if (ticket !== gen.current) return;
+      setChallenge(data);
+      onChallengeRef.current(data);
+      setLeft(Math.max(15, Math.round(data.expiresIn || FALLBACK_SECONDS)));
+      onChangeRef.current("");
+      onErrorRef.current?.(null);
+    } catch (err) {
+      if (ticket !== gen.current) return;
+      if (!silent) {
+        setChallenge(null);
+        onChallengeRef.current(null);
+      }
+      onErrorRef.current?.(toUserError(err, "بارگذاری کد امنیتی ممکن نشد"));
+    } finally {
+      rotating.current = false;
+      if (ticket === gen.current && !silent) setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void load(false);
+  }, [load]);
+
+  useEffect(() => {
+    if (!challenge) return;
+    const timer = window.setInterval(() => {
+      setLeft((n) => {
+        if (n <= 1) {
+          void load(true);
+          return n;
+        }
+        return n - 1;
+      });
+    }, 1000);
+    return () => window.clearInterval(timer);
+  }, [challenge, load]);
+
+  const minutes = String(Math.floor(left / 60)).padStart(1, "0");
+  const seconds = String(left % 60).padStart(2, "0");
+
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center justify-between gap-2">
+        <Label htmlFor={id}>کد امنیتی</Label>
+        <button
+          type="button"
+          onClick={() => void load(false)}
+          disabled={loading}
+          className="inline-flex items-center gap-1 text-xs font-medium text-primary underline-offset-4 hover:underline disabled:opacity-50"
+        >
+          <RefreshCw className={`h-3.5 w-3.5 ${loading ? "animate-spin" : ""}`} />
+          تازه‌سازی
+          {challenge && (
+            <span className="tabular-nums text-muted-foreground" dir="ltr">
+              {minutes}:{seconds}
+            </span>
+          )}
+        </button>
+      </div>
+      <div className="flex items-stretch gap-3">
+        <div
+          className="relative flex h-14 min-w-[9.5rem] shrink-0 items-center justify-center overflow-hidden rounded-xl border border-border bg-muted/60 shadow-inner"
+          aria-live="polite"
+        >
+          {challenge?.imageBase64 ? (
+            // eslint-disable-next-line @next/next/no-img-element
+            <img
+              src={`data:image/png;base64,${challenge.imageBase64}`}
+              alt="کد امنیتی"
+              width={160}
+              height={52}
+              className="h-full w-full object-contain select-none"
+              draggable={false}
+            />
+          ) : (
+            <span className="text-sm text-muted-foreground">{loading ? "…" : "—"}</span>
+          )}
+          {challenge && (
+            <span
+              aria-hidden
+              className="absolute inset-x-0 bottom-0 h-0.5 bg-primary/15"
+            >
+              <span
+                className="block h-full bg-primary transition-[width] duration-1000 ease-linear"
+                style={{ width: `${Math.min(100, (left / Math.max(challenge.expiresIn || FALLBACK_SECONDS, 1)) * 100)}%` }}
+              />
+            </span>
+          )}
+        </div>
+        <Input
+          id={id}
+          type="text"
+          autoComplete="off"
+          autoCapitalize="characters"
+          spellCheck={false}
+          value={value}
+          onChange={(e) => onChange(e.target.value.toUpperCase())}
+          required
+          dir="ltr"
+          className="h-14 text-center font-mono tracking-widest uppercase placeholder:text-center"
+          placeholder="کد تصویر"
+          maxLength={6}
+        />
+      </div>
+    </div>
+  );
+}

frontend/src/components/leaderboard-panel.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useEffect, useMemo, useState } from "react";
+import Link from "next/link";
 import { useQuery } from "@tanstack/react-query";
 import { Crown, Sparkles, Timer, Trophy } from "lucide-react";
 import { http, toUserError } from "@/lib/api";
@@ -110,10 +111,11 @@ export function LeaderboardPanel() {
             {rest.map((e) => {
               const isMe = !!user && e.userId === user.id;
               return (
-                <div
+                <Link
                   key={e.userId}
+                  href={`/profile/${e.userId}`}
                   className={cn(
-                    "flex items-center gap-3 rounded-xl border px-4 py-2.5",
+                    "flex items-center gap-3 rounded-xl border px-4 py-2.5 transition-colors hover:bg-muted/40",
                     isMe ? "border-primary/50 bg-primary/5 ring-1 ring-primary/30" : "border-border bg-card"
                   )}
                 >
@@ -135,7 +137,7 @@ export function LeaderboardPanel() {
                   <span className="shrink-0 text-sm font-bold text-gold">
                     {formatFaNumber(Math.round(e.xp))} امتیاز
                   </span>
-                </div>
+                </Link>
               );
             })}
             {rest.length === 0 && entries.length === 0 && (
@@ -197,9 +199,10 @@ function PodiumCard({
 }) {
   const isMe = myId != null && entry.userId === myId;
   return (
-    <div
+    <Link
+      href={`/profile/${entry.userId}`}
       className={cn(
-        "flex flex-col items-center rounded-2xl border-2 border-border bg-card px-3 py-4 text-center shadow-offset-sm",
+        "flex flex-col items-center rounded-2xl border-2 border-border bg-card px-3 py-4 text-center shadow-offset-sm transition-colors hover:bg-muted/40",
         tall ? "pb-6 pt-5" : "pb-4",
         isMe && "border-primary/50 ring-2 ring-primary/30",
         className
@@ -225,7 +228,7 @@ function PodiumCard({
       >
         {entry.rank === 1 ? <Crown className="h-4 w-4" /> : formatFaNumber(entry.rank)}
       </div>
-    </div>
+    </Link>
   );
 }
 

frontend/src/components/register-form.tsx

@@ -1,9 +1,9 @@
 "use client";
 
-import { useCallback, useEffect, useState, type ReactNode } from "react";
+import { useState, type ReactNode } from "react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
-import { ArrowLeft, ArrowRight, Loader2, RefreshCw, UserPlus } from "lucide-react";
+import { ArrowLeft, ArrowRight, Loader2, UserPlus } from "lucide-react";
 import { useAuth } from "@/lib/auth-store";
 import { http, toUserError } from "@/lib/api";
 import type { User } from "@/lib/types";
@@ -12,6 +12,7 @@ import { Input } from "@/components/ui/input";
 import { PasswordInput } from "@/components/ui/password-input";
 import { Label } from "@/components/ui/label";
 import { cn } from "@/lib/utils";
+import { CaptchaField, type CaptchaChallenge } from "@/components/captcha-field";
 import {
   validateEmail,
   validateName,
@@ -30,11 +31,6 @@ const STEPS = [
   { id: 3, title: "گذرواژه", hint: "رمز و کد امنیتی" },
 ] as const;
 
-type CaptchaChallenge = {
-  challengeId: string;
-  imageBase64: string;
-};
-
 type RegisterFormProps = {
   endpoint: string;
   submitLabel: string;
@@ -73,30 +69,10 @@ export function RegisterForm({ endpoint, submitLabel, description }: RegisterFor
   const [securityAnswer, setSecurityAnswer] = useState("");
   const [captchaAnswer, setCaptchaAnswer] = useState("");
   const [challenge, setChallenge] = useState<CaptchaChallenge | null>(null);
-  const [captchaLoading, setCaptchaLoading] = useState(false);
+  const [captchaKey, setCaptchaKey] = useState(0);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
 
-  const loadCaptcha = useCallback(async () => {
-    setCaptchaLoading(true);
-    setCaptchaAnswer("");
-    try {
-      const data = await http.get<CaptchaChallenge>("/api/auth/captcha");
-      setChallenge(data);
-    } catch (err) {
-      setChallenge(null);
-      setError(toUserError(err, "بارگذاری کد امنیتی ممکن نشد"));
-    } finally {
-      setCaptchaLoading(false);
-    }
-  }, []);
-
-  useEffect(() => {
-    if (step === 3) {
-      void loadCaptcha();
-    }
-  }, [step, loadCaptcha]);
-
   const goNext = () => {
     setError(null);
     if (step === 1) {
@@ -152,7 +128,7 @@ export function RegisterForm({ endpoint, submitLabel, description }: RegisterFor
     }
     if (!challenge) {
       setError("ابتدا کد امنیتی را بارگذاری کنید");
-      void loadCaptcha();
+      setCaptchaKey((k) => k + 1);
       return;
     }
     setLoading(true);
@@ -176,7 +152,7 @@ export function RegisterForm({ endpoint, submitLabel, description }: RegisterFor
       router.push("/cap");
     } catch (err) {
       setError(toUserError(err, "ثبت‌نام ناموفق بود"));
-      void loadCaptcha();
+      setCaptchaKey((k) => k + 1);
     } finally {
       setLoading(false);
     }
@@ -322,54 +298,14 @@ export function RegisterForm({ endpoint, submitLabel, description }: RegisterFor
                 placeholder="همان رمز را دوباره وارد کنید"
               />
             </Field>
-            <div className="space-y-2">
+            <CaptchaField
-              <div className="flex items-center justify-between gap-2">
+              key={captchaKey}
-                <Label htmlFor="reg-captcha">کد امنیتی</Label>
+              id="reg-captcha"
-                <button
+              value={captchaAnswer}
-                  type="button"
+              onChange={setCaptchaAnswer}
-                  onClick={() => void loadCaptcha()}
+              onChallenge={setChallenge}
-                  disabled={captchaLoading}
+              onError={setError}
-                  className="inline-flex items-center gap-1 text-xs font-medium text-primary underline-offset-4 hover:underline disabled:opacity-50"
+            />
-                >
-                  <RefreshCw className={`h-3.5 w-3.5 ${captchaLoading ? "animate-spin" : ""}`} />
-                  تازه‌سازی
-                </button>
-              </div>
-              <div className="flex items-stretch gap-3">
-                <div
-                  className="relative flex h-14 min-w-[9.5rem] shrink-0 items-center justify-center overflow-hidden rounded-xl border border-border bg-muted/60 shadow-inner"
-                  aria-live="polite"
-                >
-                  {captchaLoading || !challenge?.imageBase64 ? (
-                    <span className="text-sm text-muted-foreground">…</span>
-                  ) : (
-                    // eslint-disable-next-line @next/next/no-img-element
-                    <img
-                      src={`data:image/png;base64,${challenge.imageBase64}`}
-                      alt="کد امنیتی"
-                      width={160}
-                      height={52}
-                      className="h-full w-full object-contain select-none"
-                      draggable={false}
-                    />
-                  )}
-                </div>
-                <Input
-                  id="reg-captcha"
-                  type="text"
-                  autoComplete="off"
-                  autoCapitalize="characters"
-                  spellCheck={false}
-                  value={captchaAnswer}
-                  onChange={(e) => setCaptchaAnswer(e.target.value.toUpperCase())}
-                  required
-                  dir="ltr"
-                  className="h-14 text-center font-mono tracking-widest uppercase placeholder:text-center"
-                  placeholder="کد تصویر"
-                  maxLength={6}
-                />
-              </div>
-            </div>
           </>
         )}
 
@@ -400,7 +336,7 @@ export function RegisterForm({ endpoint, submitLabel, description }: RegisterFor
               variant="gradient"
               className="h-12 min-w-0 flex-1"
               size="lg"
-              disabled={loading || captchaLoading || !challenge}
+              disabled={loading || !challenge}
             >
               {loading ? <Loader2 className="h-4 w-4 animate-spin" /> : <UserPlus className="h-4 w-4" />}
               {submitLabel}

frontend/src/components/ui/user-avatar.tsx

@@ -1,8 +1,9 @@
 "use client";
 
+import { useEffect, useRef, useState } from "react";
 import BoringAvatar from "boring-avatars";
-import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
 import { cn } from "@/lib/utils";
+import { mediaObjectKey } from "@/lib/media";
 
 const AVATAR_COLORS = ["#7d6df2", "#0f9b8e", "#16a34a", "#d97706", "#9333ea", "#0891b2", "#65a30d", "#f59e0b"];
 export { AVATAR_COLORS };
@@ -41,6 +42,40 @@ export function avatarPropsOf(u: AvatarOwner): { src: string | null; variant: Av
   };
 }
 
+function useSettledPhoto(src?: string | null): string | null {
+  const [painted, setPainted] = useState<string | null>(null);
+  const paintedRef = useRef<string | null>(null);
+
+  useEffect(() => {
+    if (!src) {
+      paintedRef.current = null;
+      setPainted(null);
+      return;
+    }
+    if (src === paintedRef.current) return;
+    let cancel = false;
+    const img = new Image();
+    img.onload = () => {
+      if (cancel) return;
+      paintedRef.current = src;
+      setPainted(src);
+    };
+    img.onerror = () => {
+      if (cancel) return;
+      if (mediaObjectKey(src) !== mediaObjectKey(paintedRef.current)) {
+        paintedRef.current = null;
+        setPainted(null);
+      }
+    };
+    img.src = src;
+    return () => {
+      cancel = true;
+    };
+  }, [src]);
+
+  return painted;
+}
+
 export function UserAvatar({
   name,
   src,
@@ -54,12 +89,17 @@ export function UserAvatar({
   palette?: string[];
   className?: string;
 }) {
-  if (src) {
+  const painted = useSettledPhoto(src);
+  if (painted) {
     return (
-      <Avatar className={cn("ring-1 ring-black/5 dark:ring-white/10", className)}>
+      <span
-        <AvatarImage src={src} alt={name} />
+        className={cn(
-        <AvatarFallback />
+          "relative inline-grid shrink-0 place-items-center overflow-hidden rounded-full bg-background ring-1 ring-black/5 dark:ring-white/10",
-      </Avatar>
+          className
+        )}
+      >
+        <img src={painted} alt={name} className="h-full w-full object-cover" draggable={false} />
+      </span>
     );
   }
   return (

frontend/src/hooks/use-cached-media.ts

@@ -0,0 +1,36 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { mediaObjectKey } from "@/lib/media";
+import { loadCachedMedia } from "@/lib/transfer";
+
+/** Local bytes for an image or similar object. A replacement has a new key and loads again. Video is not cached. */
+export function useCachedObjectUrl(url: string, cacheable = true): string {
+  const key = mediaObjectKey(url);
+  const [local, setLocal] = useState("");
+
+  useEffect(() => {
+    if (!cacheable || !url) {
+      setLocal("");
+      return;
+    }
+    let dead = false;
+    let objectUrl = "";
+    void loadCachedMedia(url)
+      .then((blob) => {
+        if (dead) return;
+        objectUrl = URL.createObjectURL(blob);
+        setLocal(objectUrl);
+      })
+      .catch(() => {
+        if (!dead) setLocal(url);
+      });
+    return () => {
+      dead = true;
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+    };
+  }, [cacheable, key, url]);
+
+  if (!cacheable) return url;
+  return local;
+}

frontend/src/lib/media.ts

@@ -0,0 +1,8 @@
+/** Storage path of a signed /media URL, without the rotating signature. */
+export function mediaObjectKey(src: string | null | undefined): string {
+  if (!src) return "";
+  const cut = src.indexOf("?");
+  const path = cut >= 0 ? src.slice(0, cut) : src;
+  const i = path.indexOf("/media/");
+  return i >= 0 ? path.slice(i) : path;
+}

frontend/src/lib/transfer.ts

@@ -0,0 +1,179 @@
+import { useAuth } from "./auth-store";
+import { ApiError, refreshSession, throwFromResponse } from "./api";
+import { mediaObjectKey } from "./media";
+
+const mediaCacheName = "pargar-media-v1";
+
+function apiBase(): string {
+  const fromEnv = process.env.NEXT_PUBLIC_API_URL;
+  if (fromEnv !== undefined && fromEnv !== "") return fromEnv.replace(/\/$/, "");
+  return "";
+}
+
+function requestId(): string {
+  if (typeof crypto !== "undefined" && "randomUUID" in crypto) {
+    return crypto.randomUUID().replace(/-/g, "").slice(0, 16);
+  }
+  return Math.random().toString(16).slice(2, 18);
+}
+
+async function refreshOnce(): Promise<string | null> {
+  await refreshSession();
+  return useAuth.getState().accessToken;
+}
+
+type XHRResult = { status: number; body: string; blob: Blob | null };
+
+function xhrSend(
+  method: "GET" | "POST",
+  url: string,
+  opts: {
+    token: string | null;
+    body?: FormData;
+    responseType: "json" | "blob";
+    onProgress?: (ratio: number) => void;
+  },
+): Promise<XHRResult> {
+  return new Promise((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    xhr.open(method, url);
+    xhr.withCredentials = true;
+    xhr.setRequestHeader("X-Request-ID", requestId());
+    if (opts.token) xhr.setRequestHeader("Authorization", `Bearer ${opts.token}`);
+    xhr.responseType = opts.responseType === "blob" ? "blob" : "text";
+    const progress = (e: ProgressEvent) => {
+      if (!opts.onProgress) return;
+      if (e.lengthComputable && e.total > 0) opts.onProgress(Math.min(1, e.loaded / e.total));
+    };
+    if (method === "POST") xhr.upload.onprogress = progress;
+    else xhr.onprogress = progress;
+    xhr.onload = () => {
+      resolve({
+        status: xhr.status,
+        body: opts.responseType === "json" ? String(xhr.response ?? "") : "",
+        blob: opts.responseType === "blob" ? (xhr.response as Blob) : null,
+      });
+    };
+    xhr.onerror = () => reject(new ApiError("ارتباط قطع شد", 0));
+    xhr.send(opts.body ?? null);
+  });
+}
+
+/** Multipart upload that reports how full the transfer is. */
+export async function apiFormProgress<T>(
+  path: string,
+  form: FormData,
+  onProgress?: (ratio: number) => void,
+): Promise<T> {
+  const url = `${apiBase()}${path}`;
+  const send = (token: string | null) =>
+    xhrSend("POST", url, { token, body: form, responseType: "json", onProgress });
+
+  let res = await send(useAuth.getState().accessToken);
+  if (res.status === 401 && (useAuth.getState().refreshToken || useAuth.getState().user)) {
+    res = await send(await refreshOnce());
+  }
+  if (res.status < 200 || res.status >= 300) {
+    const fake = new Response(res.body, { status: res.status, headers: { "Content-Type": "application/json" } });
+    await throwFromResponse(fake, `Upload failed (${res.status})`);
+  }
+  onProgress?.(1);
+  return JSON.parse(res.body) as T;
+}
+
+/** Download into memory and report fill ratio. Does not open a tab. */
+export async function fetchBlob(
+  url: string,
+  onProgress?: (ratio: number) => void,
+): Promise<Blob> {
+  const res = await xhrSend("GET", url, { token: null, responseType: "blob", onProgress });
+  if (res.status < 200 || res.status >= 300 || !res.blob) {
+    throw new ApiError("دانلود ممکن نشد", res.status);
+  }
+  onProgress?.(1);
+  return res.blob;
+}
+
+async function mediaCache(): Promise<Cache | null> {
+  if (typeof caches === "undefined") return null;
+  try {
+    return await caches.open(mediaCacheName);
+  } catch {
+    return null;
+  }
+}
+
+/** Bytes already saved for this object. A new photo, video, or voice is a new key. */
+export async function readCachedMedia(url: string): Promise<Blob | null> {
+  try {
+    const key = mediaObjectKey(url);
+    if (!key) return null;
+    const cache = await mediaCache();
+    const hit = await cache?.match(key);
+    if (!hit) return null;
+    return hit.blob();
+  } catch {
+    return null;
+  }
+}
+
+async function writeCachedMedia(url: string, blob: Blob): Promise<void> {
+  try {
+    const key = mediaObjectKey(url);
+    if (!key) return;
+    const cache = await mediaCache();
+    if (!cache) return;
+    await cache.put(
+      key,
+      new Response(blob, { headers: { "Content-Type": blob.type || "application/octet-stream" } }),
+    );
+  } catch {
+    // A failed cache still leaves the file ready to save.
+  }
+}
+
+function triggerDownload(blob: Blob, filename: string) {
+  const objectUrl = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = objectUrl;
+  a.download = filename || "file";
+  a.rel = "noopener";
+  document.body.appendChild(a);
+  a.click();
+  a.remove();
+  window.setTimeout(() => URL.revokeObjectURL(objectUrl), 1500);
+}
+
+/**
+ * Save a remote file after it has finished downloading.
+ * Image, audio, and other files are kept by object key, so a later save does not fetch again.
+ * Video is streamed and is not kept this way.
+ */
+export async function saveRemoteFile(
+  url: string,
+  filename: string,
+  onProgress?: (ratio: number) => void,
+  opts?: { cache?: boolean },
+): Promise<void> {
+  const cache = opts?.cache !== false;
+  if (cache) {
+    const hit = await readCachedMedia(url);
+    if (hit) {
+      onProgress?.(1);
+      triggerDownload(hit, filename);
+      return;
+    }
+  }
+  const blob = await fetchBlob(url, onProgress);
+  if (cache) await writeCachedMedia(url, blob);
+  triggerDownload(blob, filename);
+}
+
+/** One network fetch per object. Later views reuse the saved bytes until the object is replaced. */
+export async function loadCachedMedia(url: string): Promise<Blob> {
+  const hit = await readCachedMedia(url);
+  if (hit) return hit;
+  const blob = await fetchBlob(url);
+  await writeCachedMedia(url, blob);
+  return blob;
+}

frontend/src/lib/types.ts

@@ -193,6 +193,7 @@ export interface ChatMessage {
   replyTo?: number;
   pinnedAt?: string;
   pinned?: boolean;
+  editedAt?: string;
   attachment?: ChatAttachment;
   reactions?: ChatReaction[];
 }
@@ -264,6 +265,21 @@ export interface MCQQuestion {
   explanation: string;
 }
 
+export interface PublicProfile {
+  id: number;
+  name: string;
+  username: string;
+  role: Role;
+  xp: number;
+  hearts: number;
+  streakCurrent: number;
+  streakLongest: number;
+  avatarVariant?: User["avatarVariant"];
+  avatarPalette?: string;
+  avatarPhoto?: string;
+  isLocked: boolean;
+}
+
 export interface AdminStats {
   users: number;
   lessons: number;