[router] add postgres databases data connector (#12218)

sgl-router/py_src/sglang_router/router.py

@@ -6,6 +6,7 @@ from sglang_router.sglang_router_rs import (
     HistoryBackendType,
     PolicyType,
     PyOracleConfig,
+    PyPostgresConfig,
 )
 from sglang_router.sglang_router_rs import Router as _Router
 
@@ -53,6 +54,8 @@ def history_backend_from_str(backend_str: Optional[str]) -> HistoryBackendType:
         return getattr(HistoryBackendType, "None")
     elif backend_lower == "oracle":
         return HistoryBackendType.Oracle
+    elif backend_lower == "postgres":
+        return HistoryBackendType.Postgres
     else:
         raise ValueError(f"Unknown history backend: {backend_str}")
 
@@ -187,6 +190,15 @@ class Router:
         args_dict["oracle_config"] = oracle_config
         args_dict["history_backend"] = history_backend
 
+        # Convert Postgres config if needed
+        postgres_config = None
+        if history_backend == HistoryBackendType.Postgres:
+            postgres_config = PyPostgresConfig(
+                db_url=args_dict.get("postgres_db_url"),
+                pool_max=args_dict.get("postgres_pool_max", 16),
+            )
+        args_dict["postgres_config"] = postgres_config
+
         # Remove fields that shouldn't be passed to Rust Router constructor
         fields_to_remove = [
             "mini_lb",

sgl-router/py_src/sglang_router/router_args.py

@@ -544,7 +544,7 @@ class RouterArgs:
             f"--{prefix}history-backend",
             type=str,
             default=RouterArgs.history_backend,
-            choices=["memory", "none", "oracle"],
+            choices=["memory", "none", "oracle", "postgres"],
             help="History storage backend for conversations and responses (default: memory)",
         )
         # Oracle configuration