{
  "context": "Tests whether the agent follows the relational queue design instructions: correct queue column shape, QueueStatus reference table seeded with the correct lifecycle states, AppSettings for max attempts, Next_ procedure with UPDLOCK/ROWLOCK/READPAST for concurrent safety, COALESCE default for max attempts, and state classification functions.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Required queue columns present",
      "description": "The Notification base table includes all of: Status, Step, AttemptNum, Response, Error, StartedAt, Duration, ScheduledFor, UpdatedAt",
      "max_score": 10
    },
    {
      "name": "QueueStatus seeded inline",
      "description": "The QueueStatus reference table is immediately followed by INSERT statements seeding at least: Pending, Processing, Error, Failed, Completed, Cancelled",
      "max_score": 8
    },
    {
      "name": "AppSettings table present",
      "description": "An AppSettings table exists with at least the max attempts setting seeded (e.g., 'notification.maxAttempts' with value 3)",
      "max_score": 8
    },
    {
      "name": "AppSettings dot-namespace",
      "description": "The AppSettings parameter name for max attempts uses dot-separated namespace format (e.g., 'notification.maxAttempts', not 'maxAttempts' or 'MAX_ATTEMPTS')",
      "max_score": 6
    },
    {
      "name": "Next_ procedure uses READPAST",
      "description": "The Next_ (claim) procedure's SELECT statement includes READPAST in its locking hints to allow concurrent workers to skip locked rows",
      "max_score": 10
    },
    {
      "name": "Next_ procedure uses UPDLOCK and ROWLOCK",
      "description": "The Next_ procedure's SELECT statement includes both UPDLOCK and ROWLOCK hints alongside READPAST",
      "max_score": 8
    },
    {
      "name": "Max attempts from AppSettings with COALESCE",
      "description": "The Next_ procedure reads max attempts from AppSettings using COALESCE with a numeric default (e.g., COALESCE((SELECT ValInt FROM AppSettings WHERE Param = 'notification.maxAttempts'), 3))",
      "max_score": 10
    },
    {
      "name": "Max attempts in WHERE clause",
      "description": "The Next_ procedure's SELECT filters out items where AttemptNum >= @MaxAttempts directly in the WHERE clause (exhausted items are never claimed)",
      "max_score": 8
    },
    {
      "name": "State classification functions",
      "description": "At least two state classification scalar functions are defined (e.g., QueueIsProcessable_fn and QueueIsFinished_fn) that return BIT based on the status value",
      "max_score": 10
    },
    {
      "name": "Subtype tables for email and SMS",
      "description": "Separate subtype tables exist for email-specific data and SMS-specific data, each with a FK to the base Notification table and using the Base_Subtype naming pattern",
      "max_score": 8
    },
    {
      "name": "Next_ procedure is _trx",
      "description": "The claim procedure name ends with _trx and validates @@TRANCOUNT = 0 before opening its transaction",
      "max_score": 8
    },
    {
      "name": "DML error checking in Next_ procedure",
      "description": "The Next_ procedure captures @@ROWCOUNT and @@ERROR atomically after the UPDATE claim operation using SELECT @RowCnt = @@ROWCOUNT, @ErrNo = @@ERROR",
      "max_score": 6
    }
  ]
}