{
  "component": "nacl-graph-gateway",
  "version": 1,
  "description": "Add the gateway migration ledger and project write-canary identity.",
  "risk": "additive",
  "backupRequired": false,
  "statements": [
    "CREATE CONSTRAINT nacl_schema_migration_identity IF NOT EXISTS FOR (migration:SchemaMigration) REQUIRE (migration.component, migration.version) IS UNIQUE",
    "CREATE CONSTRAINT nacl_gateway_canary_project IF NOT EXISTS FOR (canary:NaclGatewayCanary) REQUIRE canary.project_id IS UNIQUE"
  ]
}