change that GameplayDatabase can have different backends, sqlite and postgresql with a Template example backend

server/Server.py

@@ -5,6 +5,7 @@ from snakes import SnakeBuilder
 
 from server.database import (
   GameplayDatabase,
+  GameplayBackendBuilder,
   StorageLoader,
 )
 from server.metrics import (
@@ -29,7 +30,7 @@ from server.services import (
 )
 
 class Server:
-  def __init__(self, data_path:str, snake_type:str, storage_type:str, debug:bool=False, check_tls_security:bool=False, metrics_backend:str='memory', metrics_redis_url:str='redis://localhost:6379/0', metrics_ttl_sec:int|None=None, gameplay_db_enabled:bool=True, gameplay_db_path:str|None=None, gameplay_db_busy_timeout_ms:int=5000):
+  def __init__(self, data_path:str, snake_type:str, storage_type:str, debug:bool=False, check_tls_security:bool=False, metrics_backend:str='memory', metrics_redis_url:str='redis://localhost:6379/0', metrics_ttl_sec:int|None=None, gameplay_db_enabled:bool=True, gameplay_db_backend:str='sqlite', gameplay_db_path:str|None=None, gameplay_db_busy_timeout_ms:int=5000, gameplay_db_pg_dsn:str|None=None):
     self.debug = debug
     self.data_path = data_path
 
@@ -74,8 +75,12 @@ class Server:
     if gameplay_db_enabled:
       db_path = gameplay_db_path or os.path.join(data_path, 'data', 'database', 'gameplay.sqlite3')
       self.gameplay_database = GameplayDatabase(
-        db_path=db_path,
-        busy_timeout_ms=gameplay_db_busy_timeout_ms,
+        backend=GameplayBackendBuilder.build(
+          backend=gameplay_db_backend,
+          db_path=db_path,
+          busy_timeout_ms=gameplay_db_busy_timeout_ms,
+          pg_dsn=gameplay_db_pg_dsn,
+        )
       )
 
     self.gameplay_tracking = GameplayTrackingService(
@@ -115,12 +120,16 @@ class Server:
       if self._startup_worker_metrics_cleared:
         return
       self._startup_worker_metrics_cleared = True
+
       if env_bool('METRICS_CLEAR_WORKERS_ON_STARTUP', True):
         should_clear = await self.metrics_collector.should_clear_worker_metrics_on_startup(env_int('METRICS_STARTUP_CLEANUP_LOCK_TTL_SEC', 300))
         if should_clear:
           await self.metrics_collector.clear_worker_metrics()
       await self.dashboard_events_service.start_listener()
 
+      if self.gameplay_database is not None:
+        await self.gameplay_database.initialize()
+
     @self.app.after_serving
     async def shutdown_state_storage():
       await self.dashboard_events_service.stop_listener()