fix: renamed PostGreSQL options env variable and allowed LRU cache to be an optional env variable

env.example

@@ -310,10 +310,13 @@ POSTGRES_IVFFLAT_LISTS=100
 # POSTGRES_SSL_ROOT_CERT=/path/to/ca-cert.pem
 # POSTGRES_SSL_CRL=/path/to/crl.pem
 
-### PostgreSQL Server Options (for Supabase Supavisor)
+### PostgreSQL Server Settings (for Supabase Supavisor)
 # Use this to pass extra options to the PostgreSQL connection string.
 # For Supabase, you might need to set it like this:
-# POSTGRES_SERVER_OPTIONS="options=reference%3D[project-ref]"
+# POSTGRES_SERVER_SETTINGS="options=reference%3D[project-ref]"
+
+# Default is 100 set to 0 to disable
+# POSTGRES_STATEMENT_CACHE_SIZE=100
 
 ### Neo4j Configuration
 NEO4J_URI=neo4j+s://xxxxxxxx.databases.neo4j.io

lightrag/kg/postgres_impl.py

@@ -76,6 +76,7 @@ class PostgreSQLDB:
 
         # Server settings
         self.server_settings = config.get("server_settings")
+        self.statement_cache_size = int(config.get("statement_cache_size"))
 
         if self.user is None or self.password is None or self.database is None:
             raise ValueError("Missing database user, password, or database")
@@ -161,9 +162,13 @@ class PostgreSQLDB:
                 "port": self.port,
                 "min_size": 1,
                 "max_size": self.max,
-                "statement_cache_size": 0,
+                "statement_cache_size": self.statement_cache_size,
             }
 
+            logger.info(
+                f"PostgreSQL, statement LRU cache size set as: {self.statement_cache_size}"
+            )
+
             # Add SSL configuration if provided
             ssl_context = self._create_ssl_context()
             if ssl_context is not None:
@@ -1392,9 +1397,13 @@ class ClientManager:
             ),
             # Server settings for Supabase
             "server_settings": os.environ.get(
-                "POSTGRES_SERVER_OPTIONS",
+                "POSTGRES_SERVER_SETTINGS",
                 config.get("postgres", "server_options", fallback=None),
             ),
+            "statement_cache_size": os.environ.get(
+                "POSTGRES_STATEMENT_CACHE_SIZE",
+                config.get("postgres", "statement_cache_size", fallback=None),
+            ),
         }
 
     @classmethod