docker-database

A set of project rules for running PostgreSQL and Elasticsearch with Docker. PostgreSQL is a relational database, while Elasticsearch is used here to support Temporal's workflow search and visibility features.

In plain words
What is it for?
Starting the database services, configuring credentials and ports, keeping PostgreSQL data between restarts, and checking database readiness.
Why use it?
It records the required database versions, settings, storage, network, and health checks so the supporting services start consistently. It also explains the use of PostGIS, a PostgreSQL extension for location-based data.

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/proyecto26/projectx/docker-database
Clone the repo
git clone --depth 1 https://github.com/proyecto26/projectx

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,871 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original 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 $0.01871
Opus 5 $0.00000 $0.00936
Sonnet 5 $0.00000 $0.00374
Haiku 4.5 $0.00000 $0.00187

Measured 2d ago against content hash f9240c7e4cab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

docker-database scanned grade A with 1 finding 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 2d ago.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

test: ["CMD-SHELL", "curl --silent --fail localhost:9200/_cluster/health || exit 1"]
.cursor/rules/infraestructure/docker-database.mdc · 243 lines

How it starts

The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Docker Database Infrastructure

Services Overview

Database Services

  • db - PostgreSQL 17 with PostGIS extension (Port 5432)
  • elasticsearch - Elasticsearch 7.17.27 for Temporal visibility (Port 9200)

PostgreSQL Configuration

Image Version (DO NOT CHANGE)

db:
  image: postgis/postgis:17-3.5

Why PostGIS? Provides PostgreSQL with geospatial extensions (PostGIS, pg_trgm, etc.)

Service Definition

db:
  image: postgis/postgis:17-3.5
  environment:
    - POSTGRES_USER=${POSTGRES_USER}
    - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
    - POSTGRES_DB=${POSTGRES_DB}
    - POSTGRES_PORT=${POSTGRES_PORT:-5432}
  ports:
    - "${POSTGRES_PORT:-5432}:5432"
  volumes:
    - postgres-data:/var/lib/postgresql/data
  networks:
    - projectx-network
  restart: unless-stopped

Health Check

healthcheck:
  test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
  interval: 5s
  timeout: 5s
  retries: 60
  start_period: 30s

Why these settings?

  • interval: 5s - Check frequently during startup
  • retries: 60 - Allow up to 5 minutes for startup (60 × 5s)
  • start_period: 30s - Grace period before health checks count as failures

Data Persistence

volumes:
  postgres-data:
    driver: local
services:
  db:
    volumes:
      - postgres-data:/var/lib/postgresql/data

Data persists across container restarts.

PostgreSQL Extensions

PostGIS Image Includes

  • postgis - Geospatial extension
  • postgis_topology - Topology support
  • postgis_tiger_geocoder - US address geocoding
  • fuzzystrmatch - Fuzzy string matching
  • postgis_sfcgal - 3D geometry support
  • pg_trgm - Trigram matching for text search

Used by Prisma

The project uses Prisma ORM which connects to this PostgreSQL instance. Connection String Format:

postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:${POSTGRES_PORT}/${POSTGRES_DB}

Elasticsearch Configuration

Image Version (DO NOT CHANGE)

elasticsearch:
  image: elasticsearch:7.17.27

Why 7.17.27? Compatible with Temporal Server 1.29.2

Read the full file on GitHub · 243 lines

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. 2d ago First seen · 243 lines · 0 tokens per session scan A f9240c7e4cab

Subscribe to this mod's changes

docker-database is a cursor rule published in the GitHub repository proyecto26/projectx (83 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,871 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.