See how meetings change over time
Keep the change details for updated events in ClickHouse and query them when plans shift.
Trigger
Event Updated
Triggers when an existing Google Calendar event is modified. Returns the event ID, change type, and the specific fields that changed with their previous and new values.
Action
Execute ClickHouse Query
Execute a sql query in clickhouse and return the results. this is the primary action for querying data from clickhouse databases.
Why this helps
Start times, locations, or other meeting details can change without leaving an easy-to-review history.
- Record changed fields with previous and new values.
- Review how plans shift over time.
- Support meeting change audits with SQL.
Setup
Build it in a few focused steps.
- 1Connect Google Calendar and ClickHouse once in the Notis portal.
- 2Create an automation in Automations, New Automation, or tell Notis from any channel.
- 3In one instruction, describe how to store each changed field and its previous and new values.
- 4Pick Event Updated as the trigger and choose where run reports should go.
- 5Test with one real event update and verify its change details in ClickHouse.
Questions about this workflow
Does this trigger provide full event data?
It returns the event ID, change type, and specific fields that changed with previous and new values.
Can I compare changes to fields not in the trigger?
No. The workflow can only record the changed fields the trigger provides unless you supply additional context.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Calendar to ClickHouse. A trigger fires from one place; an action lands in another.
Google Calendar triggers
ClickHouse actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Execute ClickHouse Query
Execute a sql query in clickhouse and return the results. this is the primary action for querying data from clickhouse databases.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Get Database Schema
Get comprehensive schema overview of an entire database including all tables and optionally their column definitions. essential for ai agents to understand the complete database structure in a single call.
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
Get Table Schema
Get detailed schema information for a specific table including column definitions, types, keys, and optionally sample data. this is essential for ai agents to understand table structure before constructing queries.
Event Canceled or Deleted
Triggers when a Google Calendar event is cancelled or deleted. Returns minimal data: event_id, summary (if available), and cancellation timestamp.
List ClickHouse Databases
List all databases in the clickhouse instance. useful for discovering available databases before querying tables.
Event Starting Soon
Triggers when a calendar event is within a configured number of minutes from starting. Returns event details, time remaining, attendees, and join links when available.
List ClickHouse Tables
List tables in clickhouse databases. returns information about tables including their engine, size, and row count.
Calendar Event Changes
**SOON TO BE DEPRECATED** - Use Calendar Event Sync (polling trigger) instead. Real-time webhook trigger for calendar event changes. Returns event metadata only. For full event data, use Calendar Event Sync (polling trigger).
Event Created
Polling trigger that fires when a new calendar event is created. Returns event ID, summary, start/end times, and organizer info.
Calendar Event Sync
Polling trigger that returns full event data including details, attendees, and metadata. For real-time notifications with basic info, use Calendar Event Changes (webhook).
Connect any two apps with Notis in the middle.
Google Calendar and ClickHouse, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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