/bkend-data

name: bkend-data
classification: capability
classification-reason: Pattern guidance may overlap with model's built-in knowledge as it improves
deprecation-risk: medium
effort: medium
description: |
  bkend.ai database — CRUD, column types, filtering, sorting, relations, indexing.
  Triggers: bkend table, bkend CRUD, bkend column, bkend relation, bkend data
user-invocable: false
agent: bkit:bkend-expert
allowed-tools:
  - Read
  - Write
  - Edit
  - Glob
  - Grep
  - Bash
  - mcp__bkend__*
imports:
  - ${PLUGIN_ROOT}/templates/shared/bkend-patterns.md

bkend.ai Database Guide

Column Types (7)

| Type | Description | Example | |------|-------------|---------| | String | Text | name, email | | Number | Numeric | age, price | | Boolean | True/false | isActive | | Date | Date/time | birthDate | | Array | Array | tags: ["a","b"] | | Object | Nested object | address: {city, zip} | | Mixed | Any type | metadata |

Constraints

• `required`: Field must have a value
• `unique`: No duplicate values allowed
• `default`: Default value when not provided

Auto System Fields

| Field | Type | Description | |-------|------|-------------| | id | String | Auto-generated unique ID | | createdBy | String | Creator user ID | | createdAt | Date | Creation timestamp | | updatedAt | Date | Last update timestamp |

**Important**: bkend uses `id` (NOT `_id`) in all API responses.

MCP Table Management Tools

| Tool | Purpose | Scope | |------|---------|-------| | `backend_table_create` | Create table | table:create | | `backend_table_list` | List tables | table:read | | `backend_table_get` | Get table detail + schema | table:read | | `backend_table_delete` | Delete table | table:delete | | `backend_field_manage` | Add/modify/delete fields | table:update | | `backend_index_manage` | Manage indexes | table:update | | `backend_schema_version_list` | Schema version history | table:read | | `backend_schema_version_get` | Schema version detail | table:read | | `backend_schema_version_apply` | Apply schema version (rollback) | table:update | | `backend_index_version_list` | Index version history | table:read | | `backend_index_version_get` | Index version detail | table:read |

MCP Data CRUD Tools

| Tool | Purpose | Key Parameters | |------|---------|----------------| | `backend_data_list` | List records (filter, sort, paginate) | tableId, page?, limit?, sortBy?, sortDirection?, andFilters?, orFilters? | | `backend_data_get` | Get single record | tableId, recordId | | `backend_data_create` | Create record | tableId, data: { field: value } | | `backend_data_update` | Partial update record | tableId, recordId, data: { field: value } | | `backend_data_delete` | Delete record | tableId, recordId |

All Data CRUD tools require: organizationId, projectId, environmentId (from `get_context`).

Filter Operators

| Operator | Meaning | Example | |----------|---------|---------| | `$eq` | Equal | `{ "status": { "$eq": "active" } }` | | `$ne` | Not equal | `{ "role": { "$ne": "admin" } }` | | `$gt` / `$gte` | Greater than / >= | `{ "age": { "$gt": 18 } }` | | `$lt` / `$lte` | Less than / <= | `{ "price": { "$lt": 100 } }` | | `$in` / `$nin` | In / Not in array | `{ "tag": { "$in": ["a","b"] } }` |

MCP Guide Docs (via search_docs)

Use `search_docs` tool to access these guides:

| Doc ID | Content | |--------|---------| | `4_howto_implement_data_crud` | CRUD implementation patterns | | `7_code_examples_data` | CRUD + file upload code examples |

Use `get_operation_schema` to get any tool's input/output schema.

REST Data API

| Method | Endpoint | Description | |--------|----------|-------------| | GET | /v1/data/{table} | List (filter, sort, page, limit) | | POST | /v1/data/{table} | Create | | GET | /v1/data/{table}/{id} | Get single | | PATCH | /v1/data/{table}/{id} | Partial update | | DELETE | /v1/data/{table}/{id} | Delete |

Filtering

• Text search: `?search=keyword`
• AND filter: `?filter[field1]=value1&filter[field2]=value2`
• Comparison operators: `$eq`, `$ne`, `$gt`, `$gte`, `$lt`, `$lte`, `$in`, `$nin`
• Sort: `?sort=field:asc` (or desc)
• Pagination: `?page=1&limit=20` (default 20, max 100)

Relations & Joins

• Configure table relationships
• Join queries for related data retrieval

Index Management

• Single/compound index creation
• Manage via MCP `backend_index_manage`
• Essential for query performance optimization

Official Documentation (Live Reference)

For the latest database documentation, use WebFetch:

• MCP Data Tools: https://raw.githubusercontent.com/ww-w-ai/bkend-docs/main/en/mcp/05-data-tools.md
• MCP Table Tools: https://raw.githubusercontent.com/ww-w-ai/bkend-docs/main/en/mcp/04-table-tools.md
• Database Guide: https://raw.githubusercontent.com/ww-w-ai/bkend-docs/main/en/database/01-overview.md
• Full TOC: https://raw.githubusercontent.com/ww-w-ai/bkend-docs/main/SUMMARY.md