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---
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title: Postgres
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icon: database
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description: Mount a Postgres database as a read-only filesystem of schemas, tables, and rows.
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---
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`PostgresResource` connects to a Postgres database via a DSN and exposes its schemas and tables as a tree the agent can list, read, and grep.
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## Config
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```python
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from mirage.resource.postgres import PostgresConfig, PostgresResource
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resource = PostgresResource(PostgresConfig(
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dsn="postgres://user:pass@host:5432/db?sslmode=require",
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schemas=["public", "analytics"], # optional allowlist
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default_row_limit=1000,
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max_read_rows=10_000,
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max_read_bytes=10 * 1024 * 1024,
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default_search_limit=100,
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))
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```
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| Field | Default | Notes |
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| --- | --- | --- |
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| `dsn` | required | Postgres connection string. Redacted in snapshots. |
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| `schemas` | `None` | Optional list to limit which schemas appear in the tree. |
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| `default_row_limit` | `1000` | Default LIMIT applied to ad-hoc reads. |
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| `max_read_rows` | `10_000` | Hard ceiling per read. |
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| `max_read_bytes` | `10 MiB` | Hard ceiling per read. |
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| `default_search_limit` | `100` | Default LIMIT for search-style queries. |
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For DSN format and permissions, see [Postgres Setup](/home/setup/postgres).
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## Mount mode
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`read` only. Postgres mounts are read-only at the resource level.
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## Snapshot behavior
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The DSN is redacted on snapshot. Loading a snapshot back requires a config file that supplies a fresh DSN.
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## File size and `du`
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`rows.jsonl` is rendered on demand, so `stat` / `ls -l` / `du` report the table's **physical storage size** (`pg_total_relation_size`: heap + indexes + TOAST + page padding), not the size of the rendered JSONL. That number can differ a lot from the content and shifts with Postgres version and vacuum state. For the actual rendered byte count, use `wc -c rows.jsonl` (which streams and counts the bytes).
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