PostgreSQL Stored Procedure for Non-Rolling Monthly Quota Reset
Suggested Use: Preventing credit hoarding and implementing fair SaaS usage caps. Ready to use with Cursor, Claude, ChatGPT. Copy the prompt, adjust any bracketed variables for your project, and refine in your AI tool.
Write a production PostgreSQL stored procedure and pg_cron schedule to enforce a strict monthly quota policy.
Policy rules:
1. Every user has a monthly limit of 10 free extractions.
2. Zero carry-forward: If a user only extracted 4 files in October, their remaining 6 expire on November 1st. They reset back to exactly 10, NEVER 16.
3. Table schema: `users_quota (user_id UUID PRIMARY KEY, extractions_used INT, quota_limit INT DEFAULT 10, last_reset_month DATE)`.
4. Procedure `check_and_deduct_quota(p_user_id UUID)` that locks row `FOR UPDATE`, checks if `last_reset_month < date_trunc('month', CURRENT_DATE)`, resets `extractions_used = 0` if new month, checks if `extractions_used < quota_limit`, increments by 1, and returns boolean `allowed`.
5. Schedule cron job running at midnight on the 1st of every month.Why Use This Prompt?
This prompt guides Cursor and Claude and ChatGPT to generate clean, production-grade PostgreSQL, Supabase, SQL, Cron code tailored for postgresql stored procedure for non-rolling monthly quota reset. It establishes strict architectural constraints—including proper error handling, modern framework conventions, and zero conversational filler. Developers can rapidly scaffold robust components, database schemas, or algorithmic utilities while maintaining code quality and maintainability.
Example Output
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High compatibility for code generation without distortion or generic artifacts.
High compatibility for code generation without distortion or generic artifacts.
High compatibility for code generation without distortion or generic artifacts.
Pro Prompt Engineering Tip
Ideal Use Case: Preventing credit hoarding and implementing fair SaaS usage caps.. Parameters: PL/pgSQL, Row-Level Locking
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