Get alerts when table structure changes
Table schema changed? Email alert fires instantly. Your team sees data structure updates before queries break.
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
Send Email
Sends an email via gmail api using the authenticated user's google profile display name, requiring `is html=true` if the body contains html and valid `s3key`, `mimetype`, `name` for any attachment.
Why this helps
Schema changes (new columns, renamed fields) break queries and automations silently. Team members use stale field names and get errors.
- Instant alert when schema changes occur
- Catch breaking changes before they cause issues
- Team aware of new columns and renamed fields
- Prevent query breakage from schema shifts
Setup
Build it in a few focused steps.
- 1Connect Google Sheets and Gmail to Notis.
- 2Create an automation: 'When the table schema in my [Sheet] changes, send an alert email with details about what changed.'
- 3Set the trigger to 'Table Schema Changed' and select your sheet and table.
- 4Specify what to include in the alert (columns added, removed, renamed, type changes, etc.).
- 5Test by adding a new column or renaming one, then confirm the alert email arrives.
Questions about this workflow
What counts as a schema change?
Adding columns, removing columns, renaming columns, or changing inferred data types. Notis detects all of these.
Will I get too many alerts?
Batch them with a Cron trigger instead: 'send one daily email summarizing all schema changes from yesterday.'
Can the alert include impact analysis?
Yes. Tell Notis to check which automations or queries might be affected and include them in the alert.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Sheets to Gmail. A trigger fires from one place; an action lands in another.
Google Sheets triggers
Gmail actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Modify email labels
Adds and/or removes specified gmail labels for a message; ensure `message id` and all `label ids` are valid (use 'listlabels' for custom label ids).
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Create email draft
Creates a gmail email draft, supporting to/cc/bcc, subject, plain/html body (ensure `is html=true` for html), attachments, and threading.
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.
Create label
Creates a new label with a unique name in the specified user's gmail account.
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.
Delete Draft
Permanently deletes a specific gmail draft using its id; ensure the draft exists and the user has necessary permissions for the given `user id`.
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.
Delete message
Permanently deletes a specific email message by its id from a gmail mailbox; for `user id`, use 'me' for the authenticated user or an email address to which the authenticated user has delegated access.
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.
Fetch emails
Fetches a list of email messages from a gmail account, supporting filtering, pagination, and optional full content retrieval.
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.
Fetch message by message ID
Fetches a specific email message by its id, provided the `message id` exists and is accessible to the authenticated `user id`.
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.
Fetch Message by Thread ID
Retrieves messages from a gmail thread using its `thread id`, where the thread must be accessible by the specified `user id`.
Connect any two apps with Notis in the middle.
Google Sheets and Gmail, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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