Number the stars the archive places after their host's name, so a refresh keeps each one's id

4c8e4a0 numbered each star it adds from the Exoplanet Archive by its place among the unmatched
hosts, in pl_name order, and the refresh workflow re-queries the archive every Monday. One host
added or dropped ahead of another renumbers it: in the review, removing a single planet row
renamed 3 276 of the 3 277 ids, and a bookmark kept on Kepler-186 (1070001620) opened Kepler-1860
under Kepler-186's stored name. HYG's and Gaia's ids do not move between refreshes; the merge's own
comment says ids are meant to hold.

archiveStarId (host-star-matching.ts, beside the matcher the ETL already imports from there) hashes
the host name with FNV-1a into the 3.7 million ids between 1 070 000 000 and 2^30, and moves a name
whose id is taken to the next free one. The added stars are sorted by id before they are appended,
so the published list stays in id order. Measured: all 4 237 archive-hosted planets change host id
once (Kepler-186 is now 1073671518), none of the others; one of the 3 277 names was probed past a
collision, and one new id falls in the old 1070000000-1070003276 range, so a bookmark saved on that
old id would open the wrong star once. Dropping the same row from a copy of the cached answer and
rerunning the exoplanet step in a scratch copy of the ETL now leaves 3 276 of 3 276 ids unchanged.
The validators pass: no duplicate id, all under 2^30.

Controls, each failing its named test: the id taken from the order of arrival, and no probing past
a taken id (1 of 801 each).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/app/shared/astro/host-star-matching.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 
-import { buildStarNameIndex, normalizeStarName, resolveHostStarId } from './host-star-matching';
+import { ARCHIVE_ID_BASE, archiveStarId, buildStarNameIndex, normalizeStarName, resolveHostStarId } from './host-star-matching';
 import { propagateProperMotion, raDegDecDistanceToXyz } from './coordinates';
 import { StarRecord } from '../models/star.model';
 
@@ -214,3 +214,19 @@ describe('resolveHostStarId', () => {
     });
   });
 });
+
+describe('archiveStarId', () => {
+  it('gives a host the same id whatever else the archive holds, inside the range left for it', () => {
+    const kepler186 = archiveStarId('Kepler-186', new Set());
+    const others = new Set(['1RXS J160929.1-210524', 'Kepler-1860', 'Kepler-452', 'TOI-700'].map((name) => archiveStarId(name, new Set())));
+    expect(archiveStarId('Kepler-186', others)).toBe(kepler186);
+    expect(others.has(kepler186)).toBe(false);
+    expect(kepler186).toBeGreaterThanOrEqual(ARCHIVE_ID_BASE);
+    expect(kepler186).toBeLessThan(2 ** 30);
+  });
+
+  it('moves a host whose id is taken to the next free one', () => {
+    const kepler186 = archiveStarId('Kepler-186', new Set());
+    expect(archiveStarId('Kepler-186', new Set([kepler186, kepler186 + 1]))).toBe(kepler186 + 2);
+  });
+});