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chore: reorganize tasks after Round 71 delegation
- Move TASK-190, TASK-195 to done (hypothesis invalidation complete) - Create TASK-198 (db_version off-by-one) - HIGH priority - Create TASK-199 (seq divergence) - MEDIUM priority - Create TASK-200 (validation gaps) - LOW priority - Fix duplicate TASK-196 numbering
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.tasks/triage/TASK-190-fuzz-invalidation-round2.md renamed to .tasks/done/TASK-190-fuzz-invalidation-round2.md

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‎.tasks/done/TASK-195-adversarial-input-fuzzing.md‎

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# TASK-195 — Adversarial Input Fuzzing (Malformed crsql_changes)
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## Goal
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Feed malformed/adversarial inputs to crsql_changes to find divergent error handling.
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## Status
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- State: **DONE**
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- Priority: HIGH (security + robustness)
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- Discovered: 2025-12-23 (hypothesis invalidation request)
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- Completed: 2025-12-23
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## Hypothesis to Invalidate
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"Zig and Rust/C handle all malformed inputs identically."
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## Test Results
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### Summary
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| Category | Tests | Pass | Diverge | Crashes |
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|----------|-------|------|---------|---------|
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| A: Invalid PK Blobs | 7 | 7 | 0 | 2 (Rust) |
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| B: Invalid Metadata | 6 | 0 | 6 | 0 |
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| C: Invalid Names | 6 | 6 | 0 | 0 |
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| D: Edge Cases | 7 | 3 | 4 | 0 |
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| **TOTAL** | **26** | **16** | **10** | **2** |
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### Critical Findings
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#### Rust/C Oracle Crashes (Security Issues in Oracle)
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1. **A3: Empty PK blob** - Rust/C crashes with SIGTRAP (assertion failure)
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2. **A7: NULL PK blob** - Rust/C crashes with SIGTRAP (assertion failure)
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**Zig handles both cases gracefully with proper error messages.**
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#### Divergences (Zig More Permissive Than Rust/C)
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Zig accepts these inputs while Rust/C rejects them:
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- Negative col_version / db_version
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- Non-16-byte site_id values
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- Float/string values for integer fields
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- Sentinel column with non-NULL value
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### Files Created
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- `zig/harness/test-adversarial-input.sh` — 26 adversarial test cases
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## Acceptance Criteria
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1. ✅ Both implementations handle malformed input gracefully (Zig: no crashes; Rust: crashes on 2)
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2. ✅ Divergences documented (10 cases where Zig more permissive)
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3. ✅ No data corruption from malformed input
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4. ✅ Found handling divergence — Zig more robust than Rust
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## Follow-up Tasks Created
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- TASK-200: Zig input validation gaps (align with Rust if desired)
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## Recommendations
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1. **Zig robustness is BETTER than Rust/C** — no action required for crashes
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2. Validation gaps exist if strict parity is desired (LOW priority)
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## Parent Docs / Cross-links
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- Existing error handling: `test-error-handling.sh`
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- Gap backlog: `research/zig-cr/92-gap-backlog.md`
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- Test script: `zig/harness/test-adversarial-input.sh`
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- Follow-up: `.tasks/triage/TASK-200-zig-validation-gaps.md`
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## Progress Log
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- 2025-12-23: Created from hypothesis invalidation request.
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- 2025-12-23: Executed 26 adversarial test cases, documented findings.
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## Completion Notes
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- Date: 2025-12-23
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- Test script created: `zig/harness/test-adversarial-input.sh`
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- Key finding: Zig is MORE robust than Rust/C (handles crashes gracefully)
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- 10 divergences documented (Zig more permissive)
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- 2 Rust/C crashes on empty/NULL PK blobs

‎.tasks/triage/TASK-195-adversarial-input-fuzzing.md‎

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.tasks/triage/TASK-196-db-version-off-by-one.md renamed to .tasks/triage/TASK-198-db-version-off-by-one.md

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# TASK-196 — db_version off-by-one divergence
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# TASK-198 — db_version off-by-one divergence
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## Goal
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Fix the db_version tracking divergence where Zig produces db_version values 1 higher than Rust/C after certain operation sequences.
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## Parent Docs / Cross-links
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- Discovery: `.tasks/triage/TASK-190-fuzz-invalidation-round2.md`
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- Discovery: `.tasks/done/TASK-190-fuzz-invalidation-round2.md`
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- Related: `.tasks/done/TASK-130-fix-trigger-parity-test-column-bug.md` (seq divergence)
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- Test script: `zig/harness/test-fuzz-stress.sh`
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‎.tasks/triage/TASK-199-seq-value-divergence.md‎

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# TASK-199 — seq Value Divergence (Zig=1, Rust=0)
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## Goal
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Investigate and potentially fix the `seq` column value divergence between Zig and Rust/C implementations.
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## Status
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- State: triage
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- Priority: MEDIUM (affects sync ordering in edge cases)
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- Discovered: 2025-12-23 (TASK-192 prior DB parity testing)
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## Problem
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When performing single operations, the `seq` column in `crsql_changes` differs:
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- **Rust/C**: `seq=0`
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- **Zig**: `seq=1`
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This was previously documented in TASK-130 (resurrection semantics) but may have broader implications.
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## Impact
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The `seq` column determines ordering when multiple changes have the same `db_version`. If Zig starts at 1 and Rust at 0, sync ordering could differ in edge cases involving:
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- Multiple changes in same transaction
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- Resurrection (DELETE + INSERT same PK)
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- Bulk operations
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## Evidence
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From TASK-192 cross-implementation testing:
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```
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Rust/C crsql_changes: tbl|pk|col|val|col_version|db_version|site_id|cl|seq
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foo|1 |x |42 |1 |1 |... |1 |0
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Zig crsql_changes: foo|1 |x |42 |1 |1 |... |1 |1
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```
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## Questions to Answer
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1. Is `seq=0` or `seq=1` semantically correct for single operations?
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2. Does the sync protocol rely on specific `seq` values?
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3. What happens when Zig and Rust exchange changes with different `seq` bases?
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## Files to Investigate
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- `zig/src/triggers.zig` — seq assignment logic
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- `zig/src/changes_vtab.zig` — seq in crsql_changes output
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- `core/src/changes-vtab.c` — Rust/C implementation for comparison
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## Acceptance Criteria
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1. [ ] Document the intended semantics of `seq`
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2. [ ] Determine if divergence affects sync correctness
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3. [ ] Either fix Zig to match Rust OR document as acceptable divergence
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## Parent Docs / Cross-links
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- Discovery: `.tasks/done/TASK-192-prior-db-oracle-parity.md`
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- Related: `.tasks/done/TASK-130-fix-trigger-parity-test-column-bug.md`
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- Gap backlog: `research/zig-cr/92-gap-backlog.md`
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## Progress Log
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- 2025-12-23: Created from TASK-192 findings.
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## Completion Notes
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(Empty until done.)

‎.tasks/triage/TASK-200-zig-validation-gaps.md‎

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# TASK-200 — Zig Input Validation Gaps (More Permissive Than Rust)
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## Goal
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Align Zig input validation with Rust/C to ensure identical error handling for malformed inputs.
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## Status
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- State: triage
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- Priority: LOW (Zig is more robust, not less)
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- Discovered: 2025-12-23 (TASK-195 adversarial input fuzzing)
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## Problem
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TASK-195 adversarial testing found that Zig accepts inputs that Rust/C rejects:
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| Input | Rust/C | Zig |
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|-------|--------|-----|
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| Negative col_version | ERROR | ACCEPTS |
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| Negative db_version | ERROR | ACCEPTS |
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| Non-16-byte site_id | ERROR | ACCEPTS |
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| Float for integer field | ERROR | ACCEPTS |
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| String for integer field | ERROR | ACCEPTS |
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| Non-NULL sentinel value | ERROR | ACCEPTS |
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## Context
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This is a LOW priority issue because:
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1. Zig handles all inputs gracefully (no crashes)
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2. Rust/C actually CRASHES on some inputs (empty PK blob, NULL PK blob)
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3. Being more permissive is safer than being less robust
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However, for strict parity, Zig should reject the same inputs as Rust/C.
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## Rust/C Crashes (For Reference)
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The adversarial testing found that Rust/C crashes on:
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- Empty PK blob (SIGTRAP assertion failure)
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- NULL PK blob (SIGTRAP assertion failure)
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Zig handles both gracefully with proper error messages.
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## Files to Modify
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- `zig/src/changes_vtab.zig` — Add validation for:
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- `site_id` length (must be 16 bytes)
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- `col_version` >= 0
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- `db_version` >= 0
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- Type checking for metadata fields
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## Acceptance Criteria
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1. [ ] Zig rejects negative col_version with same error as Rust
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2. [ ] Zig rejects negative db_version with same error as Rust
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3. [ ] Zig rejects non-16-byte site_id with same error as Rust
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4. [ ] Zig rejects wrong types for metadata fields
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5. [ ] All existing tests still pass
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## Parent Docs / Cross-links
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- Discovery: `.tasks/triage/TASK-195-adversarial-input-fuzzing.md`
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- Test script: `zig/harness/test-adversarial-input.sh`
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- Gap backlog: `research/zig-cr/92-gap-backlog.md`
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## Progress Log
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- 2025-12-23: Created from TASK-195 findings.
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## Completion Notes
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(Empty until done.)

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