first commit

backend/alembic/env.py

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+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
+
+from app import create_app
+from app.models import db
+
+config = context.config
+
+fileConfig(config.config_file_name)
+
+target_metadata = db.metadata
+
+
+def get_engine():
+    app = create_app()
+    return app.extensions["sqlalchemy"].engine
+
+
+def run_migrations_offline() -> None:
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    configuration = config.get_section(config.config_ini_section, {})
+    configuration["sqlalchemy.url"] = os.environ.get(
+        "DATABASE_URL", configuration["sqlalchemy.url"]
+    )
+
+    connectable = engine_from_config(
+        configuration,
+        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()