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e08ef01170
## Summary
- Saved views now persist a versioned, typed spec (`schemaVersion` +
`spec{compositeQuery, selectedFields, display}`) instead of a bare
composite-query blob plus an opaque, frontend-owned `extraData` string
-- mirroring the pattern dashboards already use for their v2/perses
schema.
- `/api/v1/explorer/views` keeps working exactly as before: a thin
conversion layer translates to/from the legacy wire format, including
folding `extraData`'s ad hoc JSON into the typed spec and back for
backward compatibility.
- A one-time migration rewrites existing rows into the new shape and
drops the now-unused `extra_data`/`category`/`tags` columns.
### Scaffolding decisions
- Using v2 for new handlers instead of renaming old handlers to
something else for these reasons - keep the diff minimum for easier
reviews, avoiding any git history or last updated at change in old route
registration.
- Keeping the conversion to old saved view type in handler itself rather
than `savedviewtypes` package to keep it un-exported and not let them be
available anywhere else to be used. It also enables `savedviewtypes` to
be independent on query-service models.
- Modified the existing handler and it's interface to include the v2
methods instead of adding another handlerV2 since apiserver already had
handler wired in, so don't want to pass on 2 version simultaneously.
### Breaking change
- Any unknown key in the `ExtraData` will be rejected and dropped
silently in the old APIs and give error in new version.
- If there was any way to add tag or category in saved view earlier,
that data will be lost.
- Old APIs will not support the old QB request payload, only v5 format
is supported.
---
Closes SigNoz/engineering-pod#4651
Alternative discarded https://github.com/SigNoz/signoz/pull/12208
---------
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>