Task 01: Persist inferred compaction counts

Intent

Turn consecutive persisted context-usage samples into an idempotent, restart-safe lifetime count on each task session and publish that count with live context updates.

Acceptance

One atomic repository update stores the incoming context window and increments context_compaction_count only when its valid used value is lower than the prior persisted baseline; duplicate, first, equal, and increasing samples do not increment.
A new backend service instance continues from persisted metadata, while explicit context resets and model changes retain the count and clear only the comparison baseline.
Successful session.state_changed metadata patches contain the window and resulting count together; failed or generation-stale writes publish neither.

TDD sequence

Add SQLite and PostgreSQL repository behavior cases and run them to confirm no atomic context-window/count method exists.
Add orchestrator persistence, restart, reset, duplicate, and event-patch cases and run them to confirm the count is absent.
Implement the typed metadata keys, repository contract, dialect-specific atomic update, and guarded orchestrator propagation; rerun the exact checks and refactor without widening scope.

Files likely touched

apps/backend/internal/task/models/models.go
apps/backend/internal/task/repository/sqlite/session.go
apps/backend/internal/task/repository/sqlite/session_test.go
apps/backend/internal/task/repository/sqlite/postgres_schema_test.go
apps/backend/internal/orchestrator/service.go
apps/backend/internal/orchestrator/context_window.go
apps/backend/internal/orchestrator/event_handlers_git.go
apps/backend/internal/orchestrator/event_handlers_git_test.go
apps/backend/internal/orchestrator/event_handlers_streaming.go
apps/backend/internal/orchestrator/executor/executor_interaction.go
apps/backend/internal/orchestrator/executor/executor_office.go
apps/backend/internal/backendapp/helpers.go
apps/backend/internal/backendapp/helpers_test.go
apps/backend/internal/task/service/service_turns.go

Dependencies

None.

Parallelism

sequential — repository and orchestrator changes share the session metadata contract and must land as one coherent backend slice.

Verification

cd apps/backend && go test -run 'Test(UpdateSessionContextWindow|PostgresUpdateSessionContextWindow|ContextWindowCompaction)' ./internal/task/repository/sqlite ./internal/orchestrator

Inputs

Spec What, Data model, Failure modes, Persistence guarantees, and the first six scenarios.
Existing guarded write boundary in apps/backend/internal/orchestrator/context_window.go.
Existing context event persistence and broadcast in apps/backend/internal/orchestrator/event_handlers_git.go.
Dialect rules in apps/backend/AGENTS.md and replay-safe metadata patterns in apps/backend/internal/task/repository/sqlite/session.go.

Output contract

Report the result, actual files changed, exact tests and counts, blockers, risks, and synchronized task/plan status in this conversation.

Results

RED: cd apps/backend && go test -run TestContextWindowDecreasePersistsCompactionCount ./internal/orchestrator — failed as expected because the pre-change persistence path had no context_compaction_count.
GREEN: cd apps/backend && go test -run TestUpdateSessionContextWindowSQLiteCountsStrictUsageDrops ./internal/task/repository/sqlite — 1 passed.
GREEN: cd apps/backend && go test -run 'Test(ContextWindowDecreasePersistsCompactionCount|ContextWindowCompactionCountSurvivesResetAndServiceRestart|ContextWindowCompactionCountIsPublishedWithWindowUpdate|ContextWindowResetDropsStale)' ./internal/orchestrator — 5 passed.
GREEN: cd apps/backend && go test -run 'Test(UpdateSessionContextWindowSQLiteCountsStrictUsageDrops|PostgresUpdateSessionContextWindowCountsStrictUsageDrops)' ./internal/task/repository/sqlite — SQLite behavior passed; PostgreSQL case was environment-gated and skipped because no test DSN was configured.
Final targeted package check: cd apps/backend && go test ./internal/task/repository/sqlite ./internal/orchestrator ./internal/backendapp ./internal/task/service — passed.
Full backend check: cd apps/backend && go test ./... — passed.
Review fixup: context-window event persistence is synchronous to preserve arrival order, and model-change clears route through the guarded reset callback. Full go test -race ./... was not rerun locally; the PR race job had already exposed an unrelated internal/integration failure on the previous head.
git diff --check — passed. No external services or durable data outside the test databases were changed.

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