SurveyCTO to ClickHouse Integration
AI-first ETL from SurveyCTO into ClickHouse. Governed entities, incremental sync, typed landing tables.
How Datrise loads SurveyCTO into ClickHouse
Datrise syncs SurveyCTO's form submissions, forms, fields, answers, enumerators, and submission timestamps into ClickHouse as a MergeTree table per source entity. Flexible or custom fields land in JSON or Map columns, and timestamps such as created, updated, and status changes are typed as DateTime64.
Sync is incremental: Datrise uses inserts into a ReplacingMergeTree keyed on stable id, so the latest version wins on merge, so re-runs update only what changed. Partition by month and order by (entity id, updated-at) for fast range scans. ClickHouse deduplicates asynchronously on merge, so Datrise uses ReplacingMergeTree and FINAL-safe queries rather than assuming immediate upserts.
Ideal for high-volume event analytics that need sub-second aggregation.
Endpoints
SurveyCTO: Offline-capable field survey data collection.
ClickHouse: Columnar OLAP engine for fast aggregations.
How SurveyCTO entities map to ClickHouse
| SurveyCTO entity | ClickHouse object | Notes |
|---|---|---|
| form submissions | surveycto_form_submissions | id PK · custom fields → JSON or Map columns |
| forms | surveycto_forms | id PK · linked to surveycto_form_submissions |
| fields | surveycto_fields | id PK · linked to surveycto_form_submissions |
| answers | surveycto_answers | id PK · linked to surveycto_form_submissions |
FAQ
How does Datrise handle SurveyCTO's custom fields in ClickHouse?
Flexible values are stored as JSON or Map columns, so new fields don't require a migration; strongly-typed fields — dates, numbers, and references — are promoted to native ClickHouse types.
How does the SurveyCTO to ClickHouse sync stay up to date?
It runs incrementally — Datrise uses inserts into a ReplacingMergeTree keyed on stable id, so the latest version wins on merge.
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