don't crash server when sqlite-zstd extension can't be loaded

server/database/GameplayDatabase.py

@@ -1,13 +1,21 @@
 from datetime import datetime, timezone
-import asyncio, sqlite3, json, os
+import asyncio, sqlite3, json, os, logging, sys
 from pathlib import Path
 
+logger = logging.getLogger(__name__)
+if not logger.handlers:
+  _handler = logging.StreamHandler(stream=sys.stdout)
+  _handler.setFormatter(logging.Formatter(fmt="%(levelname)s %(module)s: %(message)s"))
+  logger.addHandler(_handler)
+  logger.propagate = False
+
 _ZSTD_EXT = Path(os.environ.get("SQLITE_ZSTD_EXT", "/usr/local/lib/libsqlite_zstd.so")).expanduser().resolve()
 
 class GameplayDatabase:
   def __init__(self, db_path:str, busy_timeout_ms:int=5000):
     self.db_path = db_path
     self.busy_timeout_ms = max(1000, int(busy_timeout_ms))
+    self._zstd_available = False
     self._initialize_database()
 
   def _connect(self) -> sqlite3.Connection:
@@ -16,13 +24,18 @@ class GameplayDatabase:
       timeout=max(1, self.busy_timeout_ms // 1000),
       isolation_level=None,
     )
+    connection.row_factory = sqlite3.Row
 
-    if Path(_ZSTD_EXT).exists():
+    if _ZSTD_EXT.exists():
+      try:
         connection.enable_load_extension(True)
         connection.load_extension(str(_ZSTD_EXT))
+        self._zstd_available = True
+      except sqlite3.OperationalError as e:
+        logger.warning(f"sqlite-zstd extension skipped: {e}")
+      finally:
         connection.enable_load_extension(False)
 
-    connection.row_factory = sqlite3.Row
     connection.execute("PRAGMA foreign_keys = ON")
     connection.execute("PRAGMA journal_mode = WAL")
     connection.execute("PRAGMA synchronous = NORMAL")
@@ -102,6 +115,7 @@ class GameplayDatabase:
       self._ensure_column_exists(connection, "games", "your_snake_version", "TEXT")
       self._ensure_column_exists(connection, "games", "game_type", "TEXT")
       self._ensure_column_exists(connection, "snake_turns", "latency", "TEXT")
+      if self._zstd_available:
         self._enable_zstd_compression(connection)
       connection.execute("PRAGMA optimize")
 
@@ -121,11 +135,27 @@ class GameplayDatabase:
         connection.execute(f"CREATE INDEX IF NOT EXISTS {idx_name} ON {table}({cols})")
 
   def _ensure_column_exists(self, connection:sqlite3.Connection, table_name:str, column_name:str, column_type:str) -> None:
-    existing = connection.execute(f"PRAGMA table_info({table_name})").fetchall()
+    obj = connection.execute(
+      "SELECT type FROM sqlite_master WHERE name = ?", (table_name,)
+    ).fetchone()
+
+    if obj and obj["type"] == "view":
+      # zstd replaced this table with a view — operate on the underlying compressed table
+      underlying = f"_{table_name}_zstd"
+      exists = connection.execute(
+        "SELECT 1 FROM sqlite_master WHERE name = ? AND type = 'table'", (underlying,)
+      ).fetchone()
+      if not exists:
+        return  # nothing we can do without the extension
+      actual_table = underlying
+    else:
+      actual_table = table_name
+
+    existing = connection.execute(f"PRAGMA table_info({actual_table})").fetchall()
     if any(row["name"] == column_name for row in existing):
       return
 
-    connection.execute(f"ALTER TABLE {table_name} ADD COLUMN {column_name} {column_type}")
+    connection.execute(f"ALTER TABLE {actual_table} ADD COLUMN {column_name} {column_type}")
 
   def _enable_zstd_compression(self, connection: sqlite3.Connection) -> None:
     compressed_columns = [