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| description: Understand the n8n database structure |
| contentType: explanation |
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| # Database structure |
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| This page describes the purpose of each table in the n8n database. |
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| ## Database and query technology |
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| By default, n8n uses SQLite as the database. If you are using another database the structure will be similar, but the data-types may be different depending on the database. |
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| n8n uses [TypeORM](https://github.com/typeorm/typeorm){:target=_blank .external-link} for queries and migrations. |
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| To inspect the n8n database, you can use [DBeaver](https://dbeaver.io){:target=_blank .external-link}, which is an open-source universal database tool. |
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| ## Tables |
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| These are the tables n8n creates during setup. |
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| ### auth_identity |
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| Stores details of external authentication providers when using [SAML](/user-management/saml/index.md). |
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| ### auth_provider_sync_history |
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| Stores the history of a SAML connection. |
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| ### credentials_entity |
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| Stores the [credentials](/glossary.md#credential-n8n) used to authenticate with integrations. |
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| ### event_destinations |
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| Contains the destination configurations for [Log streaming](/log-streaming.md). |
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| ### execution_data |
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| Contains the workflow at time of running, and the execution data. |
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| ### execution_entity |
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| Stores all saved workflow executions. Workflow settings can affect which executions n8n saves. |
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| ### execution_metadata |
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| Stores [Custom executions data](/workflows/executions/custom-executions-data.md). |
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| ### installed_nodes |
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| Lists the [community nodes](/integrations/community-nodes/installation/index.md) installed in your n8n instance. |
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| ### installed_packages |
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| Details of npm community nodes packages installed in your n8n instance. [installed_nodes](#installed_nodes) lists each individual node. `installed_packages` lists npm packages, which may contain more than one node. |
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| ### migrations |
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| A log of all database migrations. Read more about [Migrations](https://github.com/typeorm/typeorm/blob/master/docs/migrations.md){:target=_blank .external-link} in TypeORM's documentation. |
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| ### project |
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| Lists the [projects](/user-management/rbac/projects.md) in your instance. |
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| ### project_relation |
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| Describes the relationship between a user and a [project](/user-management/rbac/projects.md), including the user's [role type](/user-management/rbac/role-types.md). |
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| ### role |
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| Not currently used. Foruse in future work on custom roles. |
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| ### settings |
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| Records custom instance settings. These are settings that you can't control using environment variables. They include: |
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| * Whether the instance owner is set up |
| * Whether the user chose to skip owner and user management setup |
| * License key |
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| ### shared_credentials |
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| Maps credentials to users. |
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| ### shared_workflow |
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| Maps workflows to users. |
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| ### tag_entity |
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| All workflow tags created in the n8n instance. This table lists the tags. [workflows_tags](#workflows_tags) records which workflows have which tags. |
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| ### user |
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| Contains user data. |
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| ### variables |
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| Store [variables](/code/variables.md). |
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| ### webhook_entity |
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| Records the active webhooks in your n8n instance's workflows. This isn't just webhooks uses in the Webhook node. It includes all active webhooks used by any trigger node. |
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| ### workflow_entity |
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| Your n8n instance's saved workflows. |
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| ### workflow_history |
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| Store previous versions of workflows. |
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| ### workflow_statistics |
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| Counts workflow IDs and their status. |
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| ### workflows_tags |
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| Maps tags to workflows. [tag_entity](#tag_entity) contains tag details. |
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| ## Entity Relationship Diagram (ERD) |
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