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[AZ-508] Consolidate _iso_ts_now into helpers/iso_timestamps

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Batch 48 / Cycle 1 (greenfield Step 7). Closes cumulative review
batches 31-33 F2 and 28-30 F3 by replacing the duplicated private
_iso_ts_now() one-liners with a single Layer-1 helper:

  src/gps_denied_onboard/helpers/iso_timestamps.py
  iso_ts_now() -> str

Output format matches the canonical FDR _TS fixture
(YYYY-MM-DDTHH:MM:SS.ffffffZ); no FDR schema change.

Migrated call-sites (3): c7_inference/onnx_trt_ep_runtime,
c7_inference/thermal_publisher, plus the 3 c6_tile_cache callers
that previously imported from the local c6_tile_cache/_timestamp
shim (now deleted, superseded by the Layer-1 helper).

Spec drift resolved (Choose A, user-approved): spec listed 5 call
sites + +00:00 regex; on-disk reality at batch start is 3 sites +
Z-suffix matching every existing helper and the FDR _TS fixture.
Spec preamble + AC-2 regex updated in the task file; documented in
batch_48_cycle1_report.md.

Tests: 9 new AC tests (AC-1..AC-7 + Layer-1 invariant +
public-surface defensive); 216 focused tests pass including the
unmodified AZ-272 FDR schema suite and AZ-270 / AZ-507 layering
lints. Verdict: PASS (no findings).

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Oleksandr Bezdieniezhnykh
2026-05-13 23:23:22 +03:00
parent f29897cb3a
commit 5441ea2017
15 changed files with 596 additions and 48 deletions
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_docs/02_document/module-layout.md
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@@ -360,6 +360,13 @@ Bootstrap reference: `_docs/02_tasks/todo/AZ-263_initial_structure.md`. Architec
- **Owned by**: AZ-264.
- **Consumed by**: c2_vpr, c2_5_rerank, c3_matcher.
### shared/helpers/iso_timestamps
- **File**: `src/gps_denied_onboard/helpers/iso_timestamps.py`
- **Purpose**: Single Layer-1 UTC ISO-8601 timestamp source for FDR record envelopes (`iso_ts_now() -> str`, format `YYYY-MM-DDTHH:MM:SS.ffffffZ` matching the canonical FDR `_TS` fixture). Replaces the duplicated private `_iso_ts_now` one-liners that previously lived inside `c6_tile_cache` (3 modules — already locally consolidated under `_timestamp.py`) and `c7_inference` (2 modules). Stateless free function; stdlib only.
- **Owned by**: AZ-264 (AZ-508 consolidation task).
- **Consumed by**: c6_tile_cache (`cache_budget_enforcer`, `postgres_filesystem_store`, `freshness_gate`), c7_inference (`onnx_trt_ep_runtime`, `thermal_publisher`); future C10/C11 FDR producers should import this helper rather than redefining the one-liner locally.
### shared/frame_source
- **Directory**: `src/gps_denied_onboard/frame_source/`