ErikVerheul opened a new issue, #5409:
URL: https://github.com/apache/couchdb/issues/5409
## Description
I am syncing multiple clients with doc changes from a central couchdb
document store.
When using the changes /{db}/_changes API to listen for updates and
modifications to the database for synchronization of the clients, updates are
missing while the seq counter is still counting correctly.
## Steps to Reproduce
The sync is started with a GET and url;
`${currenDb}/_changes?filter=filters/sync_filter&feed=longpoll&include_docs=true&since=now`
Then call again after a result or a timeout. Leaving out the sync_filter
makes no difference.
HOWEVER: When the data.last_seq is saved after the first call and used in
the ur as: `... &since=last_seq` in the next call, and from now on, always the
last_seq value is used, the synchronization works fine.
## Expected Behaviour
The synchronization should work with repeated since=now calls OR the
documentation should state otherwise.
## Your Environment
This behaviour is tested on Ubuntu 24.04 and Couchdb version 3.3.3. and 3.4.2
## Additional Context
Expect a bug fix or a documentation update.
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