little update

alembic/env.py

@@ -0,0 +1,48 @@
+from logging.config import fileConfig
+import os
+from pathlib import Path
+import sys
+
+from alembic import context
+from dotenv import load_dotenv
+from sqlalchemy import engine_from_config, pool
+
+PROJECT_ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(PROJECT_ROOT / "src"))
+load_dotenv(PROJECT_ROOT / ".env")
+
+from database.models import Base
+
+config = context.config
+if database_url := os.getenv("DATABASE_URL"):
+    config.set_main_option("sqlalchemy.url", database_url)
+if config.config_file_name:
+    fileConfig(config.config_file_name)
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=config.get_main_option("sqlalchemy.url"),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    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()

alembic/versions/20260812_01_create_network_pool.py

@@ -0,0 +1,32 @@
+"""create network pool
+
+Revision ID: 20260812_01
+Revises:
+Create Date: 2026-08-12
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "20260812_01"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "network_pool",
+        sa.Column("cidr", sa.String(length=18), nullable=False),
+        sa.Column("cloud_subnet_id", sa.String(length=64), nullable=False),
+        sa.Column("game_id", sa.Uuid(), nullable=True),
+        sa.Column("allocated_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("CURRENT_TIMESTAMP"), nullable=False),
+        sa.PrimaryKeyConstraint("cidr"),
+        sa.UniqueConstraint("cloud_subnet_id"),
+        sa.UniqueConstraint("game_id"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("network_pool")