# KOPR R156 — Comet Analyzer inline Fit Group rename and Multi-colour CSV export

**Base build:** `KOPR_CLEAN_BUILD_20260731_R155_COMET_ANALYZER_FIT_GROUP_COMMIT_HOTFIX.zip`  
**Date:** 2026-07-31  
**Scope:** Comet Analyzer Settings / Fit groups and Multi-colour indices result export.

## 1. User-requested changes

1. Allow a Fit Group name to be edited directly after double-clicking its table cell.
2. Add a downloadable result after `Multi-colour indices -> Calculate`, using CSV.

## 2. Fit Group inline rename

The `Fit groups` registry remains non-editable during ordinary clicks. Double-clicking only a cell in the `Fit group` column temporarily opens the standard inline cell editor.

On commit, the text is passed through the same registry operation used by `Rename group…`:

- the label must not be empty;
- labels must remain unique case-insensitively;
- the immutable `group_id` is retained;
- channel assignments remain attached by `group_id`;
- every channel assignment combobox is refreshed with the new label;
- an invalid edit is rejected and the last valid registry state is restored.

The explicit `Add group…`, `Rename group…` and `Remove group` buttons remain available. Double-click is an additional fast interaction, not a replacement for the controlled group registry.

## 3. Multi-colour CSV export

The dialog now contains `Export CSV…`.

Behavior:

- disabled until `Calculate` succeeds;
- enabled only for the currently calculated result;
- changing target, operand A/B, UTC bin width or visible-range filtering invalidates the old result and disables export;
- changing only the plot X axis remains render-only and does not recalculate bins;
- exported rows follow the currently selected axis ordering (`Date`, `Delta T`, `r`, or `log10(r)`);
- all scientific columns are exported regardless of the current axis.

CSV format:

- standard comma-separated CSV;
- UTF-8 with BOM for spreadsheet compatibility;
- decimal point retained for scientific interoperability;
- UTC timestamps use ISO 8601 and `Z`.

Columns:

```text
target_designation
operand_a_id
operand_a_label
operand_b_id
operand_b_label
bin_width_days
bin_start_utc
bin_end_utc
representative_date_utc
delta_t_days
r_au
log10_r
colour_index_mag
count_a
count_b
scatter_a_mag
scatter_b_mag
uncertainty_mag
```

Default filename example:

```text
multicolour_C_2023_R1_CCD_V_minus_CCD_R_1d.csv
```

The export serializes the already calculated immutable `ColourIndexResult`. It performs no observation reload, no new UTC binning, no ephemeris call and no physical-geometry computation.

## 4. Files changed

```text
setupobs.py
light_curve_colour_indices.py
light_curve_colour_indices_dialog.py
validate_performance_release.py
```

QA additions:

```text
r156_comet_analyzer_inline_fit_group_csv_release_gate.py
tests/test_r156_fit_group_inline_rename_csv_export.py
tests/test_r156_release_gate.py
```

## 5. Validation

- R156 release gate: **6/6 PASS**
- focused R152/R153/R155/R156 regression set: **23 passed**
- R130–R156 regression set: **203 passed, 1 skipped**
- skipped test: real PyQt5 state-machine test because PyQt5 is unavailable in the build environment;
- performance release validator: **PASS** for CLEAN and QA;
- Python AST syntax validation:
  - CLEAN: **123 files, 0 errors**;
  - QA: **365 files, 0 errors**;
- SHA-256 manifest:
  - CLEAN: **134 entries**;
  - QA: **420 entries**.

## 6. Scientific non-impact

R156 does not change:

- input observations or magnitudes;
- colour-index equation `mean(A) - mean(B)`;
- UTC binning;
- stored `Delta T`, `r` or `log10(r)` values;
- phase correction;
- fit mathematics;
- ephemeris policy.