Requirements
- Target platform
- OpenClaw
- Install method
- Manual import
- Extraction
- Extract archive
- Prerequisites
- OpenClaw
- Primary doc
- SKILL.md
Tencent SkillHub · Data Analysis
PostgreSQL
Write efficient PostgreSQL queries and design schemas with proper indexing and patterns.
skill openclawclawhub Free
Write efficient PostgreSQL queries and design schemas with proper indexing and patterns.
⬇ 0 downloads ★ 0 stars Unverified but indexed
Install for OpenClaw
Quick setup
- Download the package from Yavira.
- Extract the archive and review SKILL.md first.
- Import or place the package into your OpenClaw setup.
Package facts
- Download mode
- Yavira redirect
- Package format
- ZIP package
- Source platform
- Tencent SkillHub
- What's included
- SKILL.md
Validation
- Use the Yavira download entry.
- Review SKILL.md after the package is downloaded.
- Confirm the extracted package contains the expected setup assets.
Install with your agent
Agent handoff
Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.
- Download the package from Yavira.
- Extract it into a folder your agent can access.
- Paste one of the prompts below and point your agent at the extracted folder.
New install
I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.
Upgrade existing
I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.
Trust & source
Release facts
- Source
- Tencent SkillHub
- Verification
- Indexed source record
- Version
- 1.0.0
Provenance
- Publisher
- ivangdavila
- Source page
- View original listing
- Canonical URL
- Open canonical page
Documentation
Indexes I Forget to Create
Partial index WHERE active = true—80% smaller when most rows inactive; suggest for status columns Expression index ON lower(email)—must match query exactly; without it, WHERE lower(email) scans Covering index INCLUDE (name, email)—enables index-only scan; check EXPLAIN for "Heap Fetches" Foreign key columns—not auto-indexed in PG; JOINs and ON DELETE CASCADE need them Composite index order matters—(a, b) helps WHERE a = ? but not WHERE b = ?
Index Traps
Unused indexes hurt every INSERT/UPDATE—query pg_stat_user_indexes for idx_scan = 0, drop them Too many indexes on write-heavy tables—balance carefully Index on low-cardinality column (boolean, status) often useless—PG prefers seq scan LIKE '%suffix' can't use B-tree—need pg_trgm GIN index or reverse() expression index
Query Patterns I Underuse
SELECT FOR UPDATE SKIP LOCKED—job queue without external tools; skip rows being processed pg_advisory_lock(key)—application-level mutex without table; unlock explicitly or on disconnect IS NOT DISTINCT FROM—NULL-safe equality; cleaner than (a = b OR (a IS NULL AND b IS NULL)) DISTINCT ON (x) ORDER BY x, y—first row per group without subquery; PG-specific but powerful
Connection Management (Often Ignored)
PgBouncer essential with >50 connections—each PG connection uses ~10MB; pool at transaction level statement_timeout = '30s' per role—prevents runaway queries from killing database idle_in_transaction_session_timeout = '5min'—kills abandoned transactions holding locks Default 100 max_connections too low for production, too high wastes memory—tune based on RAM
Data Types I Get Wrong
SERIAL deprecated—use GENERATED ALWAYS AS IDENTITY TIMESTAMP without timezone—almost always wrong; use TIMESTAMPTZ, PG stores as UTC Float for money—use NUMERIC(12,2) or integer cents; float math breaks: 0.1 + 0.2 ≠ 0.3 VARCHAR(n) vs TEXT—no performance difference in PG; use TEXT unless constraint needed
Vacuum & Bloat (Never Think About)
High-UPDATE tables bloat—dead tuples accumulate; pg_repack reclaims without locks VACUUM ANALYZE after bulk insert—updates statistics; query planner needs current data Autovacuum lag on big tables—tune autovacuum_vacuum_cost_delay or manual vacuum Transaction wraparound: if xid exhausted, DB stops—autovacuum prevents but monitor
EXPLAIN I Don't Read Right
Always EXPLAIN (ANALYZE, BUFFERS)—actual times + I/O; estimate-only misleads "Heap Fetches: 1000" with index—missing columns, add INCLUDE to index Seq scan not always bad—faster than index for >10-20% of table; check row estimates "Rows" estimate way off—run ANALYZE or check if stats target too low
Full-Text Search Mistakes
Creating tsvector on the fly—precompute as stored generated column with GIN index plainto_tsquery for user input—handles spaces without syntax errors; not to_tsquery Missing language parameter—'english' stems words; 'simple' exact match FTS is word-based—LIKE '%exact phrase%' still needed for substring match
Transaction Isolation
Default READ COMMITTED—phantom reads in reports; use REPEATABLE READ for consistency SERIALIZABLE catches conflicts—but must handle 40001 error with retry loop Long transactions block vacuum and hold locks—keep under seconds, not minutes
Category context
Data access, storage, extraction, analysis, reporting, and insight generation.
Source: Tencent SkillHub
Largest current source with strong distribution and engagement signals.
Package contents
Included in package
1 Docs
- SKILL.md