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

# Activity and edge cases

> Diagnose common run and configuration issues in the current MantrixFlow workflow.

Most issues appear during validation, preview, or the first manual run.

## Destination table missing

Create the destination table in PostgreSQL before running. Enter the target in MantrixFlow as `schema.table`.

## Column mismatch

If the SQL model outputs a column that is not present in the destination table, update either the model or the table. The run should name the missing column.

## Incremental key missing

Incremental sync requires a replication key. Add a stable key such as `updated_at`, save, and run manually before scheduling.

## No primary key warning

If the destination table has no primary key, delivery appends rows and records a warning. Add a primary key when you need merge-style Upsert behavior.

## Credential changes

Re-test both connections after credential rotation. A saved pipeline can fail if a connection changes without a successful test.