diff --git a/src/drizzle/migrations/0002_bizarre_sunfire.sql b/src/drizzle/migrations/0002_bizarre_sunfire.sql
new file mode 100644
index 0000000..f7796c1
--- /dev/null
+++ b/src/drizzle/migrations/0002_bizarre_sunfire.sql
@@ -0,0 +1 @@
+ALTER TABLE "user_settings" ADD COLUMN "font_size" integer DEFAULT 15;
\ No newline at end of file
diff --git a/src/drizzle/migrations/meta/0002_snapshot.json b/src/drizzle/migrations/meta/0002_snapshot.json
new file mode 100644
index 0000000..8705292
--- /dev/null
+++ b/src/drizzle/migrations/meta/0002_snapshot.json
@@ -0,0 +1,603 @@
+{
+  "id": "25c992de-4501-4c60-97bb-c5cbfd4ef130",
+  "prevId": "dc7ae80d-12dc-4e13-9c7b-101b9f79b198",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "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
+        },
+        "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
+        },
+        "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
+        },
+        "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
+        },
+        "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.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_settings": {
+      "name": "user_settings",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "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
+        },
+        "default_model": {
+          "name": "default_model",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'claude-sonnet-4-20250514'"
+        },
+        "default_tools": {
+          "name": "default_tools",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[\"web_search\",\"code_execution\",\"web_fetch\"]'::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": {},
+      "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 268c870..2759b79 100644
--- a/src/drizzle/migrations/meta/_journal.json
+++ b/src/drizzle/migrations/meta/_journal.json
@@ -15,6 +15,13 @@
       "when": 1765991206886,
       "tag": "0001_daffy_paladin",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "7",
+      "when": 1766110727907,
+      "tag": "0002_bizarre_sunfire",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/src/drizzle/schema.ts b/src/drizzle/schema.ts
index 43d0e2f..23977ab 100644
--- a/src/drizzle/schema.ts
+++ b/src/drizzle/schema.ts
@@ -28,6 +28,7 @@ export const userSettings = pgTable('user_settings', {
   // 偏好设置
   theme: varchar('theme', { length: 20 }).default('light'),
   language: varchar('language', { length: 10 }).default('zh-CN'),
+  fontSize: integer('font_size').default(15), // 全局字体大小 (12-20)
   enableThinking: boolean('enable_thinking').default(false),
   saveChatHistory: boolean('save_chat_history').default(true),
   // 时间戳