[Drizzle-kit]: Add "squash" command to CLI - #6150
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Port the squash feature to the beta branch's DAG-aware migration model. The command combines a range of consecutive migrations into a single migration folder, preserves the snapshot chain (keeps the last snapshot's id and the first snapshot's prevIds), regenerates the migrations.js bundle when present, and guards against squashing across branches or merges in the DAG. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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This commit adds a 'squash' command to the drizzle-kit cli. This command allows users to combine a range of consecutive migrations. Squashing is particularly useful for cleaning up feature branches developed over multiple iterations that include many small, redundant, or contradictory migrations.
This is the beta (v3 folder-based migration format) port of #4927.
Changes:
squashcommandstart(i) andend(j) representing the inclusive range of migrations to be mergedito use snapshot from migrationji+1-jgenerateandmigratecommandsNote:
The
squashcommand has a single known (and intentional) failure case when some environment has been migrated to versioni < k < j.Related issues/discussions: #2859 #4897 #3492