Weiko 42c598a33a Filter stale sync workspaces by active channels (#23321)
## Context

The hourly calendar and messaging stale-sync crons currently load every
active workspace and enqueue one recovery job per workspace. Each
recovery job then enters the workspace context and queries its channels,
even when that workspace has no stale sync.

As the number of workspaces grows, the cost of this check grows with
every workspace rather than with the number of syncs that actually need
recovery. Because both crons run on the hour, this also creates a
synchronized burst of mostly unnecessary queue, database, and
workspace-context work.

## What changes

The crons now use TypeORM repository `find` operations on
`calendarChannel` and `messageChannel` before enqueueing recovery jobs:

- Select only `workspaceId` from matching channels.
- Keep only active, non-deleted workspaces.
- Keep only the scheduled and ongoing stages handled by the existing
recovery jobs.
- Treat a sync as stale when `syncStageStartedAt` is null or older than
the existing 30-minute timeout.
- Deduplicate workspace IDs in memory before enqueueing.
- Enqueue the existing recovery job only for matching workspaces.
- Share the stage definitions between candidate selection and recovery
so they cannot drift independently.

## Before and after

Before:

1. Load every active workspace.
2. Enqueue a calendar job and a messaging job for each workspace.
3. Enter every workspace context.
4. Query its channels.
5. Usually find nothing to recover.

After:

1. Run one candidate lookup for calendar channels and one for message
channels.
2. Return only the workspace ID for each potentially stale channel.
3. Deduplicate those IDs and enqueue one job per affected workspace.
4. Let the existing recovery jobs recheck and recover those channels.

Database reads now scale with stale channel candidates, while queue and
workspace-context work scale with affected workspaces rather than the
total workspace count.

## Why deduplicate in memory

TypeORM repository find options do not provide `DISTINCT`, so these
lookups can return the same workspace ID once per stale channel. A `Set`
removes those duplicates before jobs are created.

This is a deliberate tradeoff:

- The database returns only UUIDs, not full channel records.
- The scans run hourly against channel tables, and stale candidates
should remain sparse.
- It keeps the query expressed through the typed repository API.
- It avoids adding a database sort or hash aggregation for `DISTINCT`.

If candidate volume becomes large enough for result transfer or
in-process deduplication to matter, database-side deduplication can be
moved into a dedicated repository query. A practical signal would be
tens of thousands of candidates per run, a high duplicate ratio, or
measurable lookup and event-loop latency.

## Safety

- The recovery jobs and sync-state transitions are unchanged.
- The candidate lookup uses the same stage lists and timeout constants
as the recovery jobs.
- Recovery jobs still recheck staleness after dequeueing, which protects
against a channel recovering between candidate selection and execution.
- Jobs are still enqueued sequentially with per-workspace exception
handling.
- Disabled and group channels are not newly excluded, preserving the
previous recovery behavior.

## Scope

This only changes hourly stale-sync detection. It does not change normal
calendar or messaging scheduling, imports, retry policies, or recovery
state transitions.

## Testing

Added unit coverage for:

- active and non-deleted workspace filtering,
- selecting only workspace IDs,
- scheduled and ongoing stage filtering,
- null or expired `syncStageStartedAt`,
- the configured stale timeout,
- application-side workspace deduplication,
- enqueueing one recovery job per affected workspace.

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2026-07-27 08:56:28 +00:00
2026-06-11 11:02:28 +02:00

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