Backend query remodel: Phase 1 (N+1 + write explosion) + Phase 2 (CourseAssignment)#56

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mfwolffe:backend-remodel-phase1

Commits on Jun 27, 2026

Add test factories for assignments, parts, and submissions
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Fix AssignmentViewSet.list N+1 fan-out (Phase 1a)
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Fix TeacherSubmissionViewSet.recent N+1 fan-out (Phase 1a)
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Prefetch list querysets for enrollment/pieceplan/activity/grade viewsets (Phase 1a)
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Add Phase 1 remodel campaign directive; mark 1a hot-path fixes done
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Fix dashboard N+1s: select_related forward FKs, prefetch reverse, paginate (Phase 1a)
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Prefetch roster GET enrollments (Phase 1a #7)
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Collapse duplicate course/enrollment lookups in AssignmentViewSet.get_queryset (Phase 1a #14)
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Remove dead PiecePlan.assign; collapse Part.for_activity double query (Phase 1a #25, #22)
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Add composite indexes for latest-submission and attachment ordering (Phase 1a #26)
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Black-format new query-count test files
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Update campaign: mark 1a #7-#14, #22, #25, #26 complete
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Fix UserViewSet update scoping bug + N+1 (Phase 1a #13)
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Bulk-create assignments instead of per-student update_or_create (Phase 1b #15, #20)
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Collapse change_piece_instrument save loop into one UPDATE (Phase 1b #17)
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Update campaign: 1b #15-#17/#20 + #13 done; note ATOMIC_REQUESTS + migration-0033 landmine
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Format test_change_instrument.py for CI black (latest)
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Bulk-create telephone_fixed groups and assignments (Phase 1b #18, #21)
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Bulk-create roster enrollments instead of get()+create() per user (Phase 1b #19)
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Update campaign: 1b #18, #19, #21 done
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Annotate assignment list with planned order via subquery (Phase 1c #23, #24)
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Update campaign: 1c complete (#23, #24)
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Add Phase 2 design scoping (CourseAssignment): options, landmines, sequence
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Neutralize migration 0033's live-helper call (Phase 2 prerequisite)
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Record Phase 2 decision (Option B) and prerequisite-done in design doc
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Add CourseAssignment + GroupAssignment models (Phase 2 step 2)
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Dual-write CourseAssignment/GroupAssignment from assign helpers (Phase 2 step 3)
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Mark Phase 2 steps 2-3 done; expand remaining sequence in design doc
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Backfill CourseAssignment/GroupAssignment from existing Assignment rows (Phase 2 step 4)
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Add Submission course_assignment/enrollment/instrument/part + backfill (Phase 2 step 5)
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Re-key ActivityProgress to (course_assignment, enrollment) + backfill (Phase 2 step 6)
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Mark Phase 2 steps 4-6 done in design doc
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Update Phase 2 doc header: Option B, steps 1-6 built
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Add CourseAssignment read-resolution serializer with response-equivalence tests
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Flip student assignment list to resolve from CourseAssignment
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Make Submission/ActivityProgress assignment FK nullable for Phase 2 transition
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Make UserFactory default username unique to fix enrollment collisions
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Flip submission/activity-progress routes to resolve CourseAssignment by enrollment
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Make CourseFactory start_date/end_date real dates not datetimes
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Flip student assignment retrieve to resolve from CourseAssignment
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Update Phase 2 design: step 7 student read-path flip complete, teacher path remaining
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Format repo with black (latest) to satisfy CI format-check
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Commits on Jun 28, 2026