Get automatic alerts for table schema changes
When a table's columns change (added, removed, or renamed), downstream automations and queries can break, but no one gets notified. Notis monitors table schemas and posts alerts to Slack when columns change, preventing silent failures.
Trigger
Table Schema Changed
Polling trigger that detects when a table's schema changes in Google Sheets. Monitors columns added/removed/renamed and inferred type/format changes. Uses snapshot-based diffing to compare schemas between polls.
Action
Post message to channel
Deprecated: posts a message to a slack channel, direct message, or private channel. use `send message` instead.
Why this helps
Schema changes are easy to make but hard to communicate. When someone adds or removes a column, dependent automations and reports can break without anyone knowing.
- Catch schema changes before they break downstream automations
- Instantly know when columns are added, removed, or renamed
- Reduce silent failures in data pipelines
- Coordinate schema changes across your team
Setup
Build it in a few focused steps.
- 1Connect Google Sheets and Slack to Notis.
- 2Create an automation with this prompt: 'When the schema of my data table changes (columns added, removed, renamed, or types changed), post an alert to #[channel-name].'
- 3Select 'Table Schema Changed' as the trigger.
- 4Choose the Slack channel for data structure notifications.
- 5Test by adding a new column and confirm the Slack alert appears.
Questions about this workflow
What counts as a schema change?
Column additions, removals, renames, or changes to inferred type/format (e.g., text to number).
Can I get alerts only for deletions, not additions?
Yes. In your prompt, specify: 'Alert me only when columns are deleted.'
Why would formula writers care about schema changes?
If a column is deleted or renamed, formulas referencing that column will break. This alert gives them a heads-up to fix queries.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Sheets to Slack. A trigger fires from one place; an action lands in another.
Google Sheets triggers
Slack actions
Aggregate Metric Changed
Triggers when an aggregate metric (SUM/COUNT/AVG/MIN/MAX) changes in a Google Sheets spreadsheet. This trigger monitors an aggregate calculation on a target column (optionally filtered by a search column/value) and fires when the calculated result changes.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Cell Range Values Changed
Triggers when values in a specified A1 range change in Google Sheets. This trigger monitors a specific cell or range of cells and fires when any values change.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
Conditional Format Rule Changed
Triggers when conditional formatting rules change in a Google Spreadsheet. Detects when rules are added, updated, or removed. Uses snapshot-based diffing to detect changes between polls.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
Data Validation Rule Changed
Triggers when data validation rules change (added/updated/removed) in a Google Spreadsheet. Uses snapshot-based diffing to detect changes between polls.
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
Developer Metadata Changed
Triggers when developer metadata entries change (new/updated/removed) in a Google Spreadsheet. Uses snapshot-based diffing to detect changes between polls.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
Filtered Range Values Changed
Polling trigger that monitors Google Sheets filtered ranges for value changes. Uses snapshot-based diffing to detect when values matching a data filter change. Emits the matched values when changes are detected.
Add call participants
Registers new participants added to a slack call.
New Rows in Google Sheet
Simple polling trigger that monitors Google Sheets for new rows. Detects when new rows are added and returns the complete row data. Perfect for triggering any workflow based on new sheet entries.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
New Sheet Added in Google Spreadsheet
Polling trigger that detects when a new sheet is added to a Google Spreadsheet.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
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When this happens · Trigger
Do this · Action
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