# Several writes that succeed or fail together. `operations`: `[{"op": ..., ...arguments}]` where

`POST /datanotes/operations/batch/` (operation `batch`)

Several writes that succeed or fail together. `operations`: `[{"op": ..., ...arguments}]` where
`op` is a row operation (`insert_row`, `update_row`, `update_rows`, `delete_rows`, `merge_rows`,
`move_rows`, `adopt_rows`, `recompute_columns`, `align_relations`, `restore_table`) or a DDL op
(`create_table`, `add_column`, `alter_column`, …), with the same arguments as the operation (an unknown one refuses the batch) (e.g.
`values` for insert_row, `set` for update_row / update_rows). They run in order, each seeing the previous ones; if one is
refused, the ones already applied are undone (`rolled_back`). Returns `steps` (per operation, each with its result,
where `ambiguous_mentions` is as in insert_row) and
`migration_id`: undo_migration on it reverts the whole batch. Use it when a change spans several
rows (create an event and update the people in it). `dry_run` checks each operation against the
current data only.

The schema changes only through operations like this one: never edit metastore.yaml by hand (no validation, no undo).

## Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `X-Datanotes-Actor` | header | `string` | no | JSON: on whose behalf the write is made, recorded in the journal (`harness`, `model`, `session`). |

## Request body

`application/json`, required

| Property | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `operations` | `object[]` | yes |  |  |
| `summary` | `string \| null` | no | `null` |  |
| `dry_run` | `boolean` | no | `false` |  |

## Responses

| Status | Description | Body |
| --- | --- | --- |
| 200 | Done. | `object` (application/json) |
| 400 | Bad input: the body is not a JSON object, or an argument is unknown, missing or of the wrong type. | `Error` (application/json) |
| 401 | Missing or wrong bearer token. | `Error` (application/json) |
| 403 | A named token beyond its permissions (the engine's administration, tables outside its `write` patterns, schema changes without `ddl`). | `Error` (application/json) |
| 404 | Unknown table, view, migration, note or folder. | `Error` (application/json) |
| 409 | Ambiguous table name: it matches several tables (`paths` or `tables` lists them). | `AmbiguousName` (application/json) |
| 422 | Refused (validation failures, conflicts, an unmet `expect`): nothing written. Same body as 200, with `ok: false` and the reasons. | `object` (application/json) |
| 500 | Unexpected error (`{error}`), or a write that failed partway and could not be rolled back: `rolled_back: false`, `failed` lists the files left (undo_migration on `migration_id` retries the rollback). | `object \| Error` (application/json) |
| 503 | A write that failed partway (a file another program holds) and was rolled back: `rolled_back: true`, nothing written. Send it again later. Same body as 200, with `ok: false` and `failed`. | `object` (application/json) |

The schemas named here are in [openapi.json](https://datanotes.dev/openapi.json) (`components.schemas`).