db

Database rules for working with drizzle schemas and creating backend apis.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/sullyo/webapp-starter/db
Clone the repo
git clone --depth 1 https://github.com/sullyo/webapp-starter

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 277 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00277
Opus 5 $0.00000 $0.00138
Sonnet 5 $0.00000 $0.00055
Haiku 4.5 $0.00000 $0.00028

Measured today against content hash 6f74a970da66, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

db scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/db.mdc · 38 lines

What it actually says

Leverage strings with drizzle types, instead of enums: status: text("status").$type<pending | cancelled |error >().notNull()

Only use varchar for ids, similiar to the users table. Otherwise use text.

When creating a new table, leverage the id util packages/id/src/generate.ts <new_table_prefix>

`packages/id/generate.ts`

const prefixes = {
  post: "post",
  property: "prop",
  // Add new prefixes here
} as const;

For generate.ts, all you have to do is add the table name (or varation) as a key to the const. No need to use nanoid or change any other code. Also abbreviate longer words, i.e property: "cust",

Then inside packages/db/schema.ts you can use it like so:

export const properties = pgTable("properties", {
  id: varchar("id", { length: 255 })
    .primaryKey()
    .$defaultFn(() => newId("property"))
}

</new_table_prefix>

Users table doesn't need items like avatar or name, unless specificially required to sync via clerk

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today First seen · 38 lines · 0 tokens per session scan A 6f74a970da66

Subscribe to this mod's changes

db is a cursor rule published in the GitHub repository sullyo/webapp-starter (869 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 277 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.