重构时序数据库连接逻辑，移除冗余代码

app/core/config.py

@@ -116,3 +116,37 @@ def get_pg_config() -> dict:
 def get_pg_password() -> str:
     """Return PostgreSQL password (use with care)."""
     return settings.DB_PASSWORD
+
+
+def get_timescaledb_pgconn_string(
+    db_name: Optional[str] = None,
+    db_host: Optional[str] = None,
+    db_port: Optional[str] = None,
+    db_user: Optional[str] = None,
+    db_password: Optional[str] = None,
+) -> str:
+    """Return TimescaleDB connection string in psycopg conninfo format."""
+    resolved_db_name = db_name or settings.TIMESCALEDB_DB_NAME
+    resolved_db_host = db_host or settings.TIMESCALEDB_DB_HOST
+    resolved_db_port = db_port or settings.TIMESCALEDB_DB_PORT
+    resolved_db_user = db_user or settings.TIMESCALEDB_DB_USER
+    resolved_db_password = db_password or settings.TIMESCALEDB_DB_PASSWORD
+    return (
+        f"dbname={resolved_db_name} host={resolved_db_host} port={resolved_db_port} "
+        f"user={resolved_db_user} password={resolved_db_password}"
+    )
+
+
+def get_timescaledb_pg_config() -> dict:
+    """Return TimescaleDB configuration except password."""
+    return {
+        "name": settings.TIMESCALEDB_DB_NAME,
+        "host": settings.TIMESCALEDB_DB_HOST,
+        "port": settings.TIMESCALEDB_DB_PORT,
+        "user": settings.TIMESCALEDB_DB_USER,
+    }
+
+
+def get_timescaledb_pg_password() -> str:
+    """Return TimescaleDB password (use with care)."""
+    return settings.TIMESCALEDB_DB_PASSWORD