Stabilize staff concurrency and premium emoji; enable verified Drone deployment

tests/test_migrations.py

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+import asyncio
+import os
+import subprocess
+import sys
+import uuid
+
+import asyncpg
+import pytest
+from sqlalchemy.engine import make_url
+
+
+@pytest.mark.skipif(not os.getenv("TEST_DATABASE_URL", "").startswith("postgresql"), reason="requires disposable PostgreSQL")
+@pytest.mark.parametrize("baseline", [None, "20260701_perf_indexes"])
+async def test_fresh_migrations_and_schema_check(baseline):
+    url = make_url(os.environ["TEST_DATABASE_URL"])
+    temporary_database = "lottery_migration_test_" + uuid.uuid4().hex
+    admin_url = url.set(drivername="postgresql").render_as_string(hide_password=False)
+    connection = await asyncpg.connect(admin_url)
+    # Database name is generated here; the configured test database is never dropped.
+    await connection.execute(f'CREATE DATABASE "{temporary_database}"')
+    try:
+        environment = dict(os.environ, DATABASE_URL=url.set(database=temporary_database).render_as_string(hide_password=False))
+        def check(*command):
+            result = subprocess.run([sys.executable, *command], env=environment, capture_output=True, text=True, timeout=60)
+            assert result.returncode == 0, result.stderr
+        if baseline:
+            await asyncio.to_thread(check, "-m", "alembic", "upgrade", baseline)
+        await asyncio.to_thread(check, "-m", "alembic", "upgrade", "head")
+        await asyncio.to_thread(check, "-m", "alembic", "upgrade", "head")
+        await asyncio.to_thread(check, "scripts/check_schema.py")
+    finally:
+        await connection.execute(f'DROP DATABASE "{temporary_database}" WITH (FORCE)')
+        await connection.close()