PolyDB is a unified multi-model database layer offering SQL, document, vector, graph and other paradigms under one connection 1, so it is the direct match for the request. Alternatives that cover several data models are ArcadeDB, a multi-model engine with graph, document, key-value and vector support 2, and Supabase, a Postgres platform with APIs and an SDK 3.
- 1
PolyDBpolydb.devwebsite read, tools not yet checked
Unified multi-model database layer that exposes SQL, document, vector, graph and other data paradigms through one connection and Python entry point (from polydb import PolyDB) 1.
- 2
ArcadeDBarcadedb.comwebsite read, tools not yet checked
Open-source multi-model database with native graph, document, key-value, vector, search and time-series models in one ACID engine, with an MCP server 2.
official:MCP server · ArcadeDB MCP Server
- 3
Supabasesupabase.comverified and signed
Postgres development platform with an official JavaScript SDK and CLI, plus a table-listing action and upsert action for database access 313.
official:SDK · @supabase/supabase-jsCLI · supabasepackage · Supabaserepository · supabaseskill · supabase-postgres-best-practices+103 community tools built for it
for agents: supabase-postgres-best-practices · list_tables · upsert_row
Sources
- 1PolyDB | Stop The Sprawl - The Unified Theorypolydb.dev · read 2026-10-29
- 2ArcadeDB: The Open-Source Multi-Model Graph Databasearcadedb.com · read 2026-10-29
- 3Supabase | The Postgres Development Platformsupabase.com · read 2026-10-29
- 13supabase-postgres-best-practices: declares "supabase-postgres-best-practices" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
· PolyDB website read, tools not yet checked
· ArcadeDB website read, tools not yet checked
ArcadeDB: open-source multi-model graph database. Native graph, document, key-value, vector, search, and time-series in one ACID-compliant engine.
supabase-postgres-best-practices · supabase-postgres-best-practices verified and signed
Postgres best practices maintained by Supabase, for Postgres running anywhere. Load this skill BEFORE writing or changing anything that lives in a Postgres database: creating or altering tables and columns (including choosing column types), schema design, migrations and declarative schema files, RLS
weaviate · weaviate-client verified and signed
· SQLAlchemy website read, tools not yet checked
The Database Toolkit for Python
.NET · MySql.Data verified and signed
createAndQueryDB · DuckDB (Activepieces) verified and signed
Create and Query DB — Create DB from data and run query
retrieve_database · Notion (Activepieces) verified and signed
Retrieve Database Structure — Get a database's properties, field types and options.
instrumentation · prometheus-client verified and signed
database · neo4j verified and signed
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.