> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comforthub.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Who is the source of truth

> For every kind of record, which system owns it and which side wins when they disagree

When two systems both hold a record, one of them is the owner. An edit on the owner's side sticks. An edit on the other side is either carried over, or overwritten the next time the owner speaks.

| Record                        | Owner                                    | Also lives in                              | Notes                                                                                                                                                                                  |
| ----------------------------- | ---------------------------------------- | ------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Lead                          | Zoho                                     | Supabase                                   | Converting one is done in Zoho                                                                                                                                                         |
| Customer, account, property   | Zoho and Supabase, last edit wins        | QuickBooks (customer only)                 | Name, contact and address changes flow to QuickBooks                                                                                                                                   |
| Equipment (asset)             | Zoho and Supabase, last edit wins        |                                            | The app can add and edit them on site                                                                                                                                                  |
| Work order and its lines      | Zoho and Supabase, last edit wins        |                                            | The app writes lines; the billing decision is made in Supabase                                                                                                                         |
| Appointment                   | Zoho and Supabase, last edit wins        |                                            | The app marks no-show and complete                                                                                                                                                     |
| Checklist template            | Zoho                                     | Supabase (read-only copy)                  | Author in Zoho only. Nothing about a template is pushed up from here                                                                                                                   |
| Checklist answers             | Supabase (the app)                       | Zoho gets the submission                   |                                                                                                                                                                                        |
| Invoice                       | Zoho owns the amount; Supabase builds it | QuickBooks                                 | An amount edited only in Supabase is overwritten                                                                                                                                       |
| Payment                       | Supabase, from the pay page              | QuickBooks, Zoho                           | The engine records the payment when the processor approves it, and the processor posts the same payment into QuickBooks; see [How payments work](/handbook/payments/how-payments-work) |
| Subscription and its payments | Stripe                                   | Supabase, Zoho                             | A subscription payment typed into Zoho is refused                                                                                                                                      |
| Product (catalog item)        | Zoho                                     | Supabase, QuickBooks item                  |                                                                                                                                                                                        |
| Stock material, supplier      | Zoho                                     | Supabase                                   |                                                                                                                                                                                        |
| Technician                    | Zoho                                     | Supabase                                   | An email on the technician invites them to the app on its own                                                                                                                          |
| Phone agent                   | Zoho                                     | Supabase, Twilio                           | The engine makes the agent's Twilio worker and keeps its departments in step                                                                                                           |
| Timesheet, time off           | The app                                  | Zoho                                       | Approvals can happen on either side                                                                                                                                                    |
| Purchase order                | The app                                  | Zoho                                       | One made in Zoho comes down too                                                                                                                                                        |
| Payroll calendar              | Zoho (the parsed PDF)                    | Supabase                                   |                                                                                                                                                                                        |
| Calls, voicemail, texts       | Supabase (from Twilio)                   | Zoho gets one call history record per call | Every field on that record is the engine's; an edit in Zoho is pushed back                                                                                                             |

## What happens on delete

Deleting in Zoho does one of three things, fixed per module. See [Sync rules by module](/reference/sync-rules-by-module).

## Related

* [How sync works](/handbook/running/how-sync-works)
* [Names](/reference/names)
* [How it all fits together](/systems/how-it-all-fits-together)