support session persistent in postgresql

Author: cuericlee

config.yaml.full

@@ -105,6 +105,12 @@ database:
     database: 
     charset: utf8
   # [optional]
+  postgresql:
+    host: # host or ip 
+    user: 
+    password:
+    database: # database with options sinlardb?sslmode=require&channel_binding=require&options=endpoint%3Dcp-great-pearl-0a074332
+  # [optional]
   redis:
     host: 
     port: 6379  # default Redis port

veadk/memory/short_term_memory_backends/postgresql_backend.py

@@ -14,6 +14,7 @@
 
 from functools import cached_property
 from typing import Any
+from venv import logger
 
 from google.adk.sessions import (
     BaseSessionService,
@@ -33,7 +34,8 @@ class PostgreSqlSTMBackend(BaseShortTermMemoryBackend):
     postgresql_config: PostgreSqlConfig = Field(default_factory=PostgreSqlConfig)
 
     def model_post_init(self, context: Any) -> None:
-        self._db_url = f"postgresql+psycopg2://{self.postgresql_config.user}:{self.postgresql_config.password}@{self.postgresql_config.host}:{self.postgresql_config.port}/{self.postgresql_config.database}"
+        self._db_url = f"postgresql://{self.postgresql_config.user}:{self.postgresql_config.password}@{self.postgresql_config.host}:{self.postgresql_config.port}/{self.postgresql_config.database}"
+        logger.debug(self._db_url)
 
     @cached_property
     @override