refactor(core): codebase quality cleanup

- Remove user-level model settings (chat_model_id, memory_model_id,
  embedding_model_id, max_context_load_time, language) from users table
- Merge migration 0002 into 0001, remove compatibility migrations
- Delete dead conversation/resolver.go (1177 lines, only flow/resolver.go used)
- Remove type aliases (Chat=Conversation, types_alias.go)
- Fix SQL: remove AND false stub, fix UpdateChatTitle model_id,
  reset model IDs in DeleteSettings, add preauth expiry filter,
  add ListMessages limit, remove 10 dead queries
- Extract shared handler helpers (RequireChannelIdentityID, AuthorizeBotAccess)
- Rename internal/router to internal/channel/inbound
- Fix identity confusion: remove UserID->ChannelIdentityID fallbacks
- Fix all _ = var patterns with proper error logging
- Fix error propagation: storeMessages, rescheduleJob, botContainerID
- Fix naming: ModelId->ModelID, active->is_active, Duration semantic fix
- Remove dead code: mcpService, ReplyTarget, callMCPServer, sshShellQuote,
  buildSessionMetadata, ChatRequest.Language, TriggerPayload.ChatID
- Fix code quality: errors.Is(), remove goto, CreateHuman deprecated
- Remove Enable model endpoint and user-level settings CLI commands
- Regenerate sqlc, swagger, SDK

db/migrations/0001_init.up.sql

@@ -19,11 +19,6 @@ CREATE TABLE IF NOT EXISTS users (
   avatar_url TEXT,
   data_root TEXT,
   last_login_at TIMESTAMPTZ,
-  chat_model_id TEXT,
-  memory_model_id TEXT,
-  embedding_model_id TEXT,
-  max_context_load_time INTEGER NOT NULL DEFAULT 1440,
-  language TEXT NOT NULL DEFAULT 'auto',
   is_active BOOLEAN NOT NULL DEFAULT true,
   metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
   created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
@@ -39,6 +34,7 @@ CREATE TABLE IF NOT EXISTS channel_identities (
   channel_type TEXT NOT NULL,
   channel_subject_id TEXT NOT NULL,
   display_name TEXT,
+  avatar_url TEXT,
   metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
   created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
   updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),

db/migrations/0002_channel_identity_avatar.down.sql

@@ -1,2 +0,0 @@
--- 0002_channel_identity_avatar (down)
-ALTER TABLE channel_identities DROP COLUMN IF EXISTS avatar_url;

db/migrations/0002_channel_identity_avatar.up.sql

@@ -1,3 +0,0 @@
--- 0002_channel_identity_avatar
--- Add avatar_url column to channel_identities for sender profile display.
-ALTER TABLE channel_identities ADD COLUMN IF NOT EXISTS avatar_url TEXT;

db/queries/channel_identities.sql

@@ -43,8 +43,3 @@ SET user_id = $2, updated_at = now()
 WHERE id = $1
 RETURNING id, user_id, channel_type, channel_subject_id, display_name, avatar_url, metadata, created_at, updated_at;
 
--- name: ClearChannelIdentityLinkedUser :one
-UPDATE channel_identities
-SET user_id = NULL, updated_at = now()
-WHERE id = $1
-RETURNING id, user_id, channel_type, channel_subject_id, display_name, avatar_url, metadata, created_at, updated_at;

db/queries/containers.sql

@@ -29,9 +29,6 @@ ON CONFLICT (container_id) DO UPDATE SET
   last_stopped_at = EXCLUDED.last_stopped_at,
   updated_at = now();
 
--- name: GetContainerByContainerID :one
-SELECT * FROM containers WHERE container_id = sqlc.arg(container_id);
-
 -- name: GetContainerByBotID :one
 SELECT * FROM containers WHERE bot_id = sqlc.arg(bot_id) ORDER BY updated_at DESC LIMIT 1;
 

db/queries/conversations.sql

@@ -59,6 +59,7 @@ SELECT
   b.display_name AS title,
   b.owner_user_id AS created_by_user_id,
   b.metadata AS metadata,
+  chat_models.model_id AS model_id,
   b.created_at,
   b.updated_at,
   'participant'::text AS access_mode,
@@ -69,6 +70,7 @@ SELECT
   NULL::timestamptz AS last_observed_at
 FROM bots b
 LEFT JOIN bot_members bm ON bm.bot_id = b.id AND bm.user_id = sqlc.arg(user_id)
+LEFT JOIN models chat_models ON chat_models.id = b.chat_model_id
 WHERE b.id = sqlc.arg(bot_id)
   AND (b.owner_user_id = sqlc.arg(user_id) OR bm.user_id IS NOT NULL)
 ORDER BY b.updated_at DESC;
@@ -102,25 +104,29 @@ SELECT
 FROM bots b
 LEFT JOIN models chat_models ON chat_models.id = b.chat_model_id
 WHERE b.id = $1
-  AND false
 ORDER BY b.created_at DESC;
 
 -- name: UpdateChatTitle :one
-UPDATE bots
-SET display_name = sqlc.arg(title),
-    updated_at = now()
-WHERE id = sqlc.arg(id)
-RETURNING
-  id,
-  id AS bot_id,
-  CASE WHEN type = 'public' THEN 'group' ELSE 'direct' END AS kind,
+WITH updated AS (
+  UPDATE bots
+  SET display_name = sqlc.arg(title),
+      updated_at = now()
+  WHERE bots.id = sqlc.arg(bot_id)
+  RETURNING *
+)
+SELECT
+  updated.id AS id,
+  updated.id AS bot_id,
+  CASE WHEN updated.type = 'public' THEN 'group' ELSE 'direct' END AS kind,
   NULL::uuid AS parent_chat_id,
-  display_name AS title,
-  owner_user_id AS created_by_user_id,
-  metadata,
-  NULL::text AS model_id,
-  created_at,
-  updated_at;
+  updated.display_name AS title,
+  updated.owner_user_id AS created_by_user_id,
+  updated.metadata,
+  chat_models.model_id AS model_id,
+  updated.created_at,
+  updated.updated_at
+FROM updated
+LEFT JOIN models chat_models ON chat_models.id = updated.chat_model_id;
 
 -- name: TouchChat :exec
 UPDATE bots

db/queries/events.sql

@@ -6,6 +6,3 @@ VALUES (
   sqlc.arg(event_type),
   sqlc.arg(payload)
 );
-
--- name: ListLifecycleEventsByContainerID :many
-SELECT * FROM lifecycle_events WHERE container_id = sqlc.arg(container_id) ORDER BY created_at ASC;

db/queries/messages.sql

@@ -56,7 +56,8 @@ SELECT
 FROM bot_history_messages m
 LEFT JOIN channel_identities ci ON ci.id = m.sender_channel_identity_id
 WHERE m.bot_id = sqlc.arg(bot_id)
-ORDER BY m.created_at ASC;
+ORDER BY m.created_at ASC
+LIMIT 10000;
 
 -- name: ListMessagesSince :many
 SELECT

db/queries/models.sql

@@ -136,29 +136,9 @@ VALUES (
 )
 RETURNING *;
 
--- name: GetModelVariantByID :one
-SELECT * FROM model_variants WHERE id = sqlc.arg(id);
-
 -- name: ListModelVariantsByModelUUID :many
 SELECT * FROM model_variants
 WHERE model_uuid = sqlc.arg(model_uuid)
 ORDER BY weight DESC, created_at DESC;
 
--- name: ListModelVariantsByVariantID :many
-SELECT * FROM model_variants
-WHERE variant_id = sqlc.arg(variant_id)
-ORDER BY created_at DESC;
-
--- name: UpdateModelVariant :one
-UPDATE model_variants
-SET
-  variant_id = sqlc.arg(variant_id),
-  weight = sqlc.arg(weight),
-  metadata = sqlc.arg(metadata),
-  updated_at = now()
-WHERE id = sqlc.arg(id)
-RETURNING *;
-
--- name: DeleteModelVariant :exec
-DELETE FROM model_variants WHERE id = sqlc.arg(id);
 

db/queries/preauth.sql

@@ -7,6 +7,8 @@ RETURNING id, bot_id, token, issued_by_user_id, expires_at, used_at, created_at;
 SELECT id, bot_id, token, issued_by_user_id, expires_at, used_at, created_at
 FROM bot_preauth_keys
 WHERE token = $1
+  AND used_at IS NULL
+  AND (expires_at IS NULL OR expires_at > now())
 LIMIT 1;
 
 -- name: MarkBotPreauthKeyUsed :one

db/queries/settings.sql

@@ -1,19 +1,3 @@
--- name: GetSettingsByUserID :one
-SELECT id AS user_id, chat_model_id, memory_model_id, embedding_model_id, max_context_load_time, language
-FROM users
-WHERE id = $1;
-
--- name: UpsertUserSettings :one
-UPDATE users
-SET chat_model_id = $2,
-    memory_model_id = $3,
-    embedding_model_id = $4,
-    max_context_load_time = $5,
-    language = $6,
-    updated_at = now()
-WHERE id = $1
-RETURNING id AS user_id, chat_model_id, memory_model_id, embedding_model_id, max_context_load_time, language;
-
 -- name: GetSettingsByBotID :one
 SELECT
   bots.id AS bot_id,
@@ -60,5 +44,8 @@ UPDATE bots
 SET max_context_load_time = 1440,
     language = 'auto',
     allow_guest = false,
+    chat_model_id = NULL,
+    memory_model_id = NULL,
+    embedding_model_id = NULL,
     updated_at = now()
 WHERE id = $1;

db/queries/snapshots.sql

@@ -8,6 +8,3 @@ VALUES (
   sqlc.arg(digest)
 )
 ON CONFLICT (id) DO NOTHING;
-
--- name: ListSnapshotsByContainerID :many
-SELECT * FROM snapshots WHERE container_id = sqlc.arg(container_id) ORDER BY created_at ASC;

db/queries/users.sql

@@ -8,13 +8,6 @@ SELECT *
 FROM users
 WHERE id = $1;
 
--- name: UpdateUserStatus :one
-UPDATE users
-SET is_active = $2,
-    updated_at = now()
-WHERE id = $1
-RETURNING *;
-
 -- name: CreateAccount :one
 UPDATE users
 SET username = sqlc.arg(username),
@@ -54,9 +47,6 @@ ON CONFLICT (username) DO UPDATE SET
   updated_at = now()
 RETURNING *;
 
--- name: GetAccountByUsername :one
-SELECT * FROM users WHERE username = sqlc.arg(username);
-
 -- name: GetAccountByIdentity :one
 SELECT * FROM users WHERE username = sqlc.arg(identity) OR email = sqlc.arg(identity);