diff --git a/src/drizzle/migrations/0016_next_ultimo.sql b/src/drizzle/migrations/0016_next_ultimo.sql
new file mode 100644
index 0000000..23cb224
--- /dev/null
+++ b/src/drizzle/migrations/0016_next_ultimo.sql
@@ -0,0 +1,2 @@
+ALTER TABLE "conversations" ADD COLUMN "tags" jsonb DEFAULT '[]'::jsonb;--> statement-breakpoint
+ALTER TABLE "conversations" ADD COLUMN "auto_tagged_at" timestamp with time zone;
\ No newline at end of file
diff --git a/src/drizzle/migrations/meta/0016_snapshot.json b/src/drizzle/migrations/meta/0016_snapshot.json
new file mode 100644
index 0000000..dbd5a5e
--- /dev/null
+++ b/src/drizzle/migrations/meta/0016_snapshot.json
@@ -0,0 +1,1354 @@
+{
+  "id": "bb116673-684b-45bd-b89a-48f4161b5db9",
+  "prevId": "b85372bf-b7dc-4bf7-9316-43435b5a4df6",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "public.assistant_categories": {
+      "name": "assistant_categories",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(50)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "icon": {
+          "name": "icon",
+          "type": "varchar(50)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.assistants": {
+      "name": "assistants",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "category_id": {
+          "name": "category_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "icon": {
+          "name": "icon",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "system_prompt": {
+          "name": "system_prompt",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "tags": {
+          "name": "tags",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "is_builtin": {
+          "name": "is_builtin",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "use_count": {
+          "name": "use_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.conversations": {
+      "name": "conversations",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "conversation_id": {
+          "name": "conversation_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "assistant_id": {
+          "name": "assistant_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "title": {
+          "name": "title",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'新对话'"
+        },
+        "summary": {
+          "name": "summary",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "model": {
+          "name": "model",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "tools": {
+          "name": "tools",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "enable_thinking": {
+          "name": "enable_thinking",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "system_prompt": {
+          "name": "system_prompt",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "temperature": {
+          "name": "temperature",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "message_count": {
+          "name": "message_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "total_tokens": {
+          "name": "total_tokens",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "is_archived": {
+          "name": "is_archived",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "is_pinned": {
+          "name": "is_pinned",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "tags": {
+          "name": "tags",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "auto_tagged_at": {
+          "name": "auto_tagged_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "last_message_at": {
+          "name": "last_message_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "conversations_conversation_id_unique": {
+          "name": "conversations_conversation_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "conversation_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.messages": {
+      "name": "messages",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "message_id": {
+          "name": "message_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "conversation_id": {
+          "name": "conversation_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "role": {
+          "name": "role",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "content": {
+          "name": "content",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "thinking_content": {
+          "name": "thinking_content",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "thinking_collapsed": {
+          "name": "thinking_collapsed",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "tool_calls": {
+          "name": "tool_calls",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "tool_results": {
+          "name": "tool_results",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "images": {
+          "name": "images",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "uploaded_images": {
+          "name": "uploaded_images",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "uploaded_documents": {
+          "name": "uploaded_documents",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "used_tools": {
+          "name": "used_tools",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "search_images": {
+          "name": "search_images",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "generated_images": {
+          "name": "generated_images",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "input_tokens": {
+          "name": "input_tokens",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "output_tokens": {
+          "name": "output_tokens",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "status": {
+          "name": "status",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'completed'"
+        },
+        "error_message": {
+          "name": "error_message",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "feedback": {
+          "name": "feedback",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "messages_message_id_unique": {
+          "name": "messages_message_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "message_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.models": {
+      "name": "models",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "model_id": {
+          "name": "model_id",
+          "type": "varchar(128)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "varchar(128)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "model_type": {
+          "name": "model_type",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'claude'"
+        },
+        "supports_tools": {
+          "name": "supports_tools",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "supports_thinking": {
+          "name": "supports_thinking",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "supports_vision": {
+          "name": "supports_vision",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "max_tokens": {
+          "name": "max_tokens",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 8192
+        },
+        "context_window": {
+          "name": "context_window",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 200000
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "is_default": {
+          "name": "is_default",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "models_model_id_unique": {
+          "name": "models_model_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "model_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.notes": {
+      "name": "notes",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "note_id": {
+          "name": "note_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "conversation_id": {
+          "name": "conversation_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "message_id": {
+          "name": "message_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "title": {
+          "name": "title",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "content": {
+          "name": "content",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "tags": {
+          "name": "tags",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "is_pinned": {
+          "name": "is_pinned",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "is_archived": {
+          "name": "is_archived",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "notes_note_id_unique": {
+          "name": "notes_note_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "note_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.prompt_optimizations": {
+      "name": "prompt_optimizations",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "original_prompt": {
+          "name": "original_prompt",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "optimized_prompt": {
+          "name": "optimized_prompt",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "mode": {
+          "name": "mode",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.shared_conversations": {
+      "name": "shared_conversations",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "share_id": {
+          "name": "share_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "conversation_id": {
+          "name": "conversation_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "share_code": {
+          "name": "share_code",
+          "type": "varchar(12)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "title": {
+          "name": "title",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "include_thinking": {
+          "name": "include_thinking",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "include_tool_calls": {
+          "name": "include_tool_calls",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "include_images": {
+          "name": "include_images",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "view_count": {
+          "name": "view_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "snapshot_at": {
+          "name": "snapshot_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "selected_message_ids": {
+          "name": "selected_message_ids",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "shared_conversations_share_id_unique": {
+          "name": "shared_conversations_share_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "share_id"
+          ]
+        },
+        "shared_conversations_share_code_unique": {
+          "name": "shared_conversations_share_code_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "share_code"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.tools": {
+      "name": "tools",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "tool_id": {
+          "name": "tool_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "varchar(128)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "icon": {
+          "name": "icon",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "input_schema": {
+          "name": "input_schema",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "is_default": {
+          "name": "is_default",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "tools_tool_id_unique": {
+          "name": "tools_tool_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "tool_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.user_favorite_assistants": {
+      "name": "user_favorite_assistants",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "assistant_id": {
+          "name": "assistant_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.user_settings": {
+      "name": "user_settings",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cch_url": {
+          "name": "cch_url",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'http://localhost:13500'"
+        },
+        "cch_api_key": {
+          "name": "cch_api_key",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cch_api_key_configured": {
+          "name": "cch_api_key_configured",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "metaso_api_key": {
+          "name": "metaso_api_key",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "metaso_api_key_configured": {
+          "name": "metaso_api_key_configured",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "api_format": {
+          "name": "api_format",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'claude'"
+        },
+        "default_model": {
+          "name": "default_model",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'claude-sonnet-4-5-20250929'"
+        },
+        "default_tools": {
+          "name": "default_tools",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[\"web_search\",\"web_fetch\",\"mita_search\",\"mita_reader\"]'::jsonb"
+        },
+        "system_prompt": {
+          "name": "system_prompt",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "temperature": {
+          "name": "temperature",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0.7'"
+        },
+        "theme": {
+          "name": "theme",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'light'"
+        },
+        "language": {
+          "name": "language",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'zh-CN'"
+        },
+        "font_size": {
+          "name": "font_size",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 15
+        },
+        "enable_thinking": {
+          "name": "enable_thinking",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "save_chat_history": {
+          "name": "save_chat_history",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "user_settings_user_id_unique": {
+          "name": "user_settings_user_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "user_id"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.users": {
+      "name": "users",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "password": {
+          "name": "password",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "nickname": {
+          "name": "nickname",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "avatar": {
+          "name": "avatar",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "plan": {
+          "name": "plan",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'free'"
+        },
+        "status": {
+          "name": "status",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'active'"
+        },
+        "email_verified": {
+          "name": "email_verified",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "last_login_at": {
+          "name": "last_login_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "users_user_id_unique": {
+          "name": "users_user_id_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "user_id"
+          ]
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "email"
+          ]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.verification_codes": {
+      "name": "verification_codes",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "code": {
+          "name": "code",
+          "type": "varchar(6)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "type": {
+          "name": "type",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "used": {
+          "name": "used",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    }
+  },
+  "enums": {},
+  "schemas": {},
+  "sequences": {},
+  "roles": {},
+  "policies": {},
+  "views": {},
+  "_meta": {
+    "columns": {},
+    "schemas": {},
+    "tables": {}
+  }
+}
\ No newline at end of file
diff --git a/src/drizzle/migrations/meta/_journal.json b/src/drizzle/migrations/meta/_journal.json
index 474d455..ebb08a6 100644
--- a/src/drizzle/migrations/meta/_journal.json
+++ b/src/drizzle/migrations/meta/_journal.json
@@ -113,6 +113,13 @@
       "when": 1766812096044,
       "tag": "0015_milky_anthem",
       "breakpoints": true
+    },
+    {
+      "idx": 16,
+      "version": "7",
+      "when": 1766857466874,
+      "tag": "0016_next_ultimo",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/src/drizzle/schema.ts b/src/drizzle/schema.ts
index b0659fe..eaf1cd6 100644
--- a/src/drizzle/schema.ts
+++ b/src/drizzle/schema.ts
@@ -173,6 +173,9 @@ export const conversations = pgTable('conversations', {
   // 状态
   isArchived: boolean('is_archived').default(false),
   isPinned: boolean('is_pinned').default(false),
+  // 标签系统
+  tags: jsonb('tags').$type<string[]>().default([]),           // 对话标签数组
+  autoTaggedAt: timestamp('auto_tagged_at', { withTimezone: true }), // AI 自动标签生成时间
   // 时间戳
   createdAt: timestamp('created_at', { withTimezone: true }).defaultNow(),
   updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow(),