[model-gateway] Add PostgreSQL support to binding (#13766)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Simo Lin <linsimo.mark@gmail.com>
Co-authored-by: Chang Su <chang.s.su@oracle.com>

sgl-router/bindings/python/sglang_router/router.py

@@ -210,6 +210,8 @@ class Router:
             "oracle_pool_min",
             "oracle_pool_max",
             "oracle_pool_timeout_secs",
+            "postgres_db_url",
+            "postgres_pool_max",
         ]
         for field in fields_to_remove:
             args_dict.pop(field, None)

sgl-router/bindings/python/sglang_router/router_args.py

@@ -109,6 +109,8 @@ class RouterArgs:
     oracle_pool_min: int = 1
     oracle_pool_max: int = 16
     oracle_pool_timeout_secs: int = 30
+    postgres_db_url: Optional[str] = None
+    postgres_pool_max: int = 16
     # mTLS configuration for worker communication
     client_cert_path: Optional[str] = None
     client_key_path: Optional[str] = None
@@ -598,6 +600,19 @@ class RouterArgs:
             ),
             help="Oracle connection pool timeout in seconds (default: 30, env: ATP_POOL_TIMEOUT_SECS)",
         )
+        # Postgres configuration
+        parser.add_argument(
+            f"--{prefix}postgres-db-url",
+            type=str,
+            default=os.getenv("POSTGRES_DB_URL"),
+            help="PostgreSQL database connection URL (env: POSTGRES_DB_URL)",
+        )
+        parser.add_argument(
+            f"--{prefix}postgres-pool-max",
+            type=int,
+            default=int(os.getenv("POSTGRES_POOL_MAX", RouterArgs.postgres_pool_max)),
+            help="Maximum PostgreSQL connection pool size (default: 16, env: POSTGRES_POOL_MAX)",
+        )
         # mTLS configuration
         parser.add_argument(
             f"--{prefix}client-cert-path",