diff --git a/app.py b/app.py
index f7221aa..1b8cbba 100644
--- a/app.py
+++ b/app.py
@@ -534,8 +534,9 @@ def sync_admin_from_env():
         set_setting("admin_password_hash", generate_password_hash(env_password))
 
 
-init_db()
-app.logger.info("数据库: %s", database_label())
+if os.getenv("QIHUO_SKIP_INIT_DB") != "1":
+    init_db()
+    app.logger.info("数据库: %s", database_label())
 
 
 def sync_ths_token():
diff --git a/db_conn.py b/db_conn.py
index 60a295a..89fa593 100644
--- a/db_conn.py
+++ b/db_conn.py
@@ -197,7 +197,11 @@ class DbConnection:
 
     def execute(self, sql: str, params: Sequence[Any] | None = None) -> DbCursor:
         cur = self.cursor()
-        return cur.execute(sql, params)
+        try:
+            return cur.execute(sql, params)
+        except Exception:
+            rollback_if_postgres(self)
+            raise
 
     def cursor(self) -> DbCursor:
         if self._backend == "sqlite":
diff --git a/scripts/deploy_postgres.sh b/scripts/deploy_postgres.sh
index 15540d1..93db2e5 100644
--- a/scripts/deploy_postgres.sh
+++ b/scripts/deploy_postgres.sh
@@ -66,10 +66,21 @@ echo "==> Python 依赖..."
 source "$APP_DIR/venv/bin/activate"
 pip install -q -r "$APP_DIR/requirements.txt"
 
+if [ "$MIGRATE_SQLITE" = "1" ]; then
+  echo "==> 重置 PostgreSQL 库（迁移模式）..."
+  sudo -u postgres psql -v ON_ERROR_STOP=0 -c \
+    "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${PG_DB}' AND pid <> pg_backend_pid();" \
+    >/dev/null 2>&1 || true
+  sudo -u postgres dropdb --if-exists "${PG_DB}"
+  sudo -u postgres createdb -O "${PG_USER}" "${PG_DB}"
+fi
+
 echo "==> 初始化 PostgreSQL 表结构..."
 cd "$APP_DIR"
 export DATABASE_URL
+export QIHUO_SKIP_INIT_DB=1
 python3 -c "from app import init_db; init_db(); from db_conn import database_label; print('OK:', database_label())"
+unset QIHUO_SKIP_INIT_DB
 
 if [ "$MIGRATE_SQLITE" = "1" ] && [ -f "$APP_DIR/futures.db" ]; then
   echo "==> 从 SQLite 迁移数据..."