Add default ORDER BY id to BaseModel.select() for PostgreSQL compatibility

PostgreSQL does not guarantee row order without ORDER BY, unlike SQLite
which implicitly returned rows by rowid. This caused bugs where queries
returned results in unexpected order (e.g., get_team_by_owner returning
gauntlet team instead of main team).

Override select() in BaseModel to add default ordering by id. Explicit
.order_by() calls will override this default.

Also mark legacy db_engine.py as deprecated.

app/db_engine.py

@@ -178,6 +178,17 @@ class BaseModel(Model):
     class Meta:
         database = db
 
+    @classmethod
+    def select(cls, *fields):
+        """Override select to add default ordering by id for PostgreSQL compatibility.
+
+        PostgreSQL does not guarantee row order without ORDER BY, unlike SQLite
+        which implicitly returned rows by rowid. This ensures consistent ordering
+        across all queries unless explicitly overridden with .order_by().
+        """
+        query = super().select(*fields)
+        return query.order_by(cls.id)
+
 
 class Current(BaseModel):
     season = IntegerField()

db_engine.py

@@ -1,4 +1,11 @@
 import math
+
+"""
+DEPRECATED: This file is a legacy implementation from before the deployment
+of /database/app/. The active codebase is now in /database/app/db_engine.py.
+This file is kept for reference only and should not be used.
+"""
+
 from datetime import datetime
 from typing import List
 import logging