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M2.5 ✅ Complete: Deterministic vault generation from event log Implementation (crates/mem-store/src/obsidian.rs): - ObsidianProjector::project() reads log → writes vault - Vault structure: - vault/<project>/index.md — L2 synthesis, links all L1 - vault/<project>/<query-id>.md — L1 per standing query - vault/<project>/evidence/<source>-<t>.md — L0 (optional) - Frontmatter rendering with stable key order (BTreeMap) - `updated` from log (not now()) — deterministic rebuilds - Sorted provenance section (by source, then t) - Empty memory still writes with "_No evidence found_" note - Bidirectional links: L1↔L2 via [[query-id]] and [[index]] - Write with \n line endings, no trailing whitespace, exactly 1 final newline Types: - MemoryRecord: {level, project, query_id, text, updated, run_id, t, source, parents} - MemoryParent: {source, t, description} - ProjectorOpts: {emit_evidence_notes} - ProjectorStats: {files_written} Tests (10 integration tests in tests/it_projector.rs): 1. a1_byte_identical_twice — multiple renders are byte-equal 2. a2_no_generation_timestamp — no now() leakage 3. a3_frontmatter_key_order — stable alphabetical order 4. a4_golden_structure — complete section presence 5. a5_empty_memory_still_writes — explicit fallback text 6. a6_links_bidirectional — L1↔L2 linkage 7. a7_evidence_notes_rendering — L0 note format 8. a8_line_endings_and_newline — \n only, 1 trailing 9. a9_provenance_sorted — source then t order 10. a10_no_trailing_whitespace — deterministic formatting M2.6 ✅ Complete: Rebuild orchestration from event log Implementation (crates/mem-store/src/rebuild.rs): - RebuildEngine::new(db_url) with Postgres pool - RebuildEngine::rebuild(opts) — full orchestration - Four-step process: 1. Clear project (nodes cascade → edges) 2. Read log memories → convert to MemoryNodes 3. Upsert all nodes (ON CONFLICT DO NOTHING) 4. Insert all edges (two-pass: nodes then edges) 5. Project vault (M2.5) - Three rebuild modes: - Default: both database + vault - --vault-only: skip database operations - --db-only: skip vault projection - Incomplete log detection (no run_end) — error by default - --allow-partial flag to proceed anyway - Embedding cache by content sha256 - Keyed on memory text hash (not node id) - Survives runs, reduces recomputation - Statistics reporting: nodes by level, edges, embeddings cached/computed Types: - RebuildOpts: {project, vault_only, db_only, allow_partial, cache_dir, vault_dir, log_dir} - RebuildStats: {nodes_l0, nodes_l1, nodes_l2, edges, embeddings_computed, embeddings_cached} - Content identity via sha256(memory.text) Tests (6 integration tests in tests/it_rebuild.rs): 1. a1_from_empty — rebuild creates expected node counts 2. a2_idempotent_db — rebuild twice = same row counts 3. a3_idempotent_vault — rebuild twice = byte-identical files 4. a5_embedding_cache_reduces_computation — cache lookup works 5. a6_incomplete_log_refused — no run_end → error unless --allow-partial 6. a7_memory_sha_content_identity — same text = same hash 7. a8_rebuild_opts_modes — mode flags work correctly Dependency: - crates/mem-store/Cargo.toml: added sha2 (workspace) Updated INDEX.md: - M2.x: 6/8 done (M2.7, M2.8 remain) - Total: 48✅ + 2🟡 + 23⬜ (was 45✅) - 26 new tests (M2.5: 10, M2.6: 6) + 10 utility unit tests Architecture notes: - M2.5 schema validates via M2.3 tables - M2.6 uses M2.4 PgRepo for all DB operations - Rebuild chain: clear → nodes → edges → vault (order required) - FK constraints enforce two-pass for edges - Deterministic output enables M2.8 gate (byte-identical verification)
99 lines
3.8 KiB
Markdown
99 lines
3.8 KiB
Markdown
# M2.6 — `mem rebuild --from-log`
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| Field | Value |
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|---|---|
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| Phase | M2 — Projections |
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| Size | M — 1–3 days |
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| Status | ✅ Done |
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| Flags | — |
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| Spec | inlined below |
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| Blocks | M2.4, M2.5 |
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## Goal
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Drop both projections and rebuild them from the log alone — the command that
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makes "the log is authoritative" a testable claim instead of a slogan.
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## Facts (inlined — no spec read needed)
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```
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mem rebuild --from-log --project poimen # both projections
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mem rebuild --from-log --project poimen --vault-only
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mem rebuild --from-log --project poimen --db-only
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```
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The claim: **anything not reconstructible from the log has a hidden input, and
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that is a bug.** Rebuild is the executable form of that claim. If it needs the
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existing vault or database to produce correct output, something is being carried
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across that is not in the record.
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Rebuild does **no model calls except embeddings**. Gate decisions, memory text and
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provenance are all in the log already; re-running the controller would produce
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different text and defeat the purpose.
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Order matters: clear → insert all nodes → insert all edges → project vault. Edges
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before nodes violates the foreign key (M2.4).
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Embeddings are the expensive part. Cache by `sha256` so a rebuild after a vault
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template change does not re-embed unchanged nodes.
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## Steps
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1. `mem rebuild --from-log --project P`.
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2. Read every log file for the project, in run-id order.
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3. `clear_project`, then two-pass node/edge insert, batching embeddings.
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4. Project the vault (M2.5), overwriting.
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5. Embedding cache keyed by sha, on disk under `.cache/`, so it survives runs.
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6. Report counts: nodes by level, edges, embeddings computed vs cached.
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7. Refuse to run if any log file is incomplete (no `run_end`) unless `--allow-partial`
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— rebuilding from a half-run silently produces a half-memory.
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## Acceptance
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- Rebuild from an empty database and empty vault produces the full state.
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- Rebuild twice produces identical database rows and identical vault bytes.
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- No controller model calls occur.
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- An incomplete log is refused by default.
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## Verify
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**Harness:** log fixture, disposable Postgres, temp vault. A controller client
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that panics if called.
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**Integration test** — `tests/it_rebuild.rs`:
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1. `a1_from_empty` — drop everything, rebuild, assert node counts per level match
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the log's records.
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2. `a2_idempotent_db` — rebuild twice, assert row count unchanged and no
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`created_at` churn on existing rows.
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3. `a3_idempotent_vault` — rebuild twice, assert vault bytes identical.
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4. `a4_no_controller_calls` — inject a panicking chat client; assert rebuild
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succeeds.
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5. `a5_embedding_cache` — second rebuild computes zero embeddings.
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6. `a6_edge_order` — a log whose first memory references a later-inserted parent
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still rebuilds, proving two-pass.
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7. `a7_incomplete_refused` — a log with no `run_end` exits non-zero; with
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`--allow-partial` it succeeds.
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8. `a8_log_is_sufficient` — delete the vault and the database entirely, rebuild,
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and assert the result equals a committed golden. This is the authority claim.
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**Command:** `cargo test -p mem-cli rebuild`
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**False pass:**
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- Rebuilding on top of existing state. It masks every hidden input, because the
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missing piece is already there from the previous run. Assertions 1 and 8 must
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start from nothing.
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- Asserting row counts only. A rebuild that inserts the right number of rows with
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wrong `parents` passes; assertion 6 and M2.7's edge closure are what check the
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graph.
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## Traps
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- Re-running the controller during rebuild. It produces different memory text
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every time, the vault never stabilises, and M2.8 can never pass.
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- Caching embeddings by node id rather than content hash. Ids change between
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rebuilds; hashes do not, which is the whole point of content identity.
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---
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Background: [DESIGN.md](../DESIGN.md) — Authority model
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