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alembic/env.py

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+from logging.config import fileConfig
+import os
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+from dotenv import load_dotenv
+load_dotenv()
+
+config = context.config
+fileConfig(config.config_file_name)
+
+# Ensure alembic picks up DATABASE_URL (or DB_URL) from environment
+import os
+db_url = os.getenv("DATABASE_URL") or os.getenv("DB_URL")
+if db_url:
+    config.set_main_option("sqlalchemy.url", db_url)
+
+target_metadata = None
+
+def run_migrations_offline():
+    url = os.getenv("DATABASE_URL")
+    context.configure(url=url, target_metadata=target_metadata, literal_binds=True)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()