Reducing Notion API Payloads with Server-Side Filters and Cursors
Use Notion's nested filter blocks and start_cursor pagination to fetch only the data your integration needs, reducing requests and rate-limit risk.
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Notion API database query pagination limits and result bounding
Bounding total results from a Notion database query for a large dataset requires understanding pagination behavior and result metadata. The query endpoint supports cursor pagination with page_size and start_cursor, and responses include has_more and next_cursor. No total result count is returned in the documented response shape, so bounding total size would
Notion API filter exclusion of formula, rollup, and relation properties forces client-side filtering
Supported feature and symptom The Notion API's query database endpoint accepts filter objects for a defined set of property types — title, rich_text, number, select, multi_select, date, checkbox, url, email, phone_number, created_time, last_edited_time, created_by, and last_edited_by. Formula, rollup, and relation properties are not included in this allowlis
Small page_size vs. Tightened Filters for Large Database Pagination
When retrieving large datasets from a Notion database via the API, developers must manage the volume of data returned per request to prevent client-side memory exhaustion or request timeouts. The API provides page_size to control the number of results per page, alongside start_cursor for pagination. There is a trade-off between adjusting the transport volume
WebSocket payload size limit exceeded in Reflex state sync
Problem: Large dataset in State causes WebSocket timeout In Reflex, a centralized State class synchronizes variables between the Python backend and the React frontend over a WebSocket connection. When a State variable holds thousands of records, the JSON payload generated for each update can exceed typical browser or server limits, leading to a WebSocket pay
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