(Reviewing Diff 1409468)
The schema change, migration and set-union upsert look correct: NULL values are coalesced, and the new column is guarded by both the version check and a column-existence check. The scheduler change follows the same metadata shape as the midChat path. The main weak spot is cleanup timing in the new browser test.

Looks good, thanks for the update and discussion @gmalekpour 🚀 I'll leave the context decision with you, but it was a useful thought exercise for me around how we use context (thanks for humouring me on the finer details 😅).

Code analysis found 2 defects in diff 1409759:

• 2 defects found by android-lints (Mozlint)

Looks good.

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Code analysis found 4 defects in diff 1409766:

• 4 defects found by eslint (Mozlint)

Figma: