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bf6dc4472b
The is_private flag is intended to be set if recipient type is 'private'(1) or 'huddle'(3), otherwise i.e if it is 'stream'(2), it should be unset. This commit adds a database index for the is_private flag (which we'll need to use it). That index is used to reset the flag if it was already set. The already set flags were due to a previous removal of is_me_message flag for which the values were not cleared out. For now, the is_private flag is always 0 since the really hard part of this migration is clearing the unspecified previous state; future commits will fully implement it actually doing something. History: Migration rewritten significantly by tabbott to ensure it runs in only 3 minutes on chat.zulip.org. A key detail in making that work was to ensure that we use the new index for the queries to find rows to update (which currently requires the `order_by` and `limit` clauses).
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