Observed Signal · Aug 21, 2026 · Technical Release · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Safely Drop All PostgreSQL Tables (2026)
A technical how-to describing safe methods to drop all tables in a PostgreSQL database. The article shows a one-command reset (DROP SCHEMA public CASCADE; CREATE SCHEMA public; GRANT ...), explains PostgreSQL 15 default changes that revoke CREATE from PUBLIC and set public's owner to pg_database_owner (which can cause permission errors), and details Supabase-specific risks (Dropping public can remove Supabase-managed schemas and extensions). It gives variants to preserve extensions (reinstall extensions or drop tables only via a DO-block loop), recommends wrapping resets in transactions for local dev, and provides a production safety checklist: take backups, confirm connection, block connections, and restore from pg_dump/pg_restore rather than dropping schema in prod.
Practical technical guidance for database engineers. Useful operational advice but not specific to AdTech and has limited industry-wide impact.
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Key Takeaways & Evidence Grounding
- DROP SCHEMA public CASCADE removes the public schema and all dependent objects (tables, views, sequences, functions, triggers).
- PostgreSQL 15 defaults: PUBLIC no longer has CREATE by default, and the owner of public is pg_database_owner, which can cause 'permission denied for schema public' after recreating the schema.
- On Supabase, DROP SCHEMA public CASCADE can cascade into Supabase-managed schemas (auth, storage, realtime, graphql) and break the project; use 'supabase db reset' for dev and restore from backups for production.
- To preserve extensions and functions, drop only tables using a PL/pgSQL loop over pg_tables rather than dropping the entire schema.
- Wrap destructive resets in a transaction on local databases and always take and verify backups (pg_dump/pg_restore) before running destructive operations in production.
Connected Companies & Entities
2 Entities mapped“The original Stack Overflow thread ("How can I drop all the tables in a PostgreSQL database?") has been viewed more than 1.5 million times f...”
“On a hosted Supabase project, public is not the only schema that matters.”
Ontology Mapping & Concepts
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