?codes= filters by LANGUAGE, which is what a partner's list usually is and the wrong
filter for a list of peoples. The reach table measured the gap in its own rows: its
Mandarin row counts 36 groups, those 36 speak 30 codes, and 55 Doxa groups speak those
30 — so a link from a 36-group row drew 55 pins. Akha's 33 drew 57; SUN's 93 drew 116.
The extra groups are real and also have nothing; they belong to a different row.
So the map takes ?groups=<slug list> and filters by people group. The slug is
doxa.life's own — carried from the roster into the pin rows, and read in the builder
off the prayer URL their API built from it, never constructed from a name, because a
slug this build invented could name somebody else's people. All 369 of those rows
carry a prayer URL, measured before relying on it.
Row and map now agree by construction: 0 of 35 rows disagree, and the Mandarin link
renders "36 / 2,107" on the map against a row claiming 36. The gate asserts exact
equality for a three-slug link and 0 for an unknown slug — the failure that would
quietly turn a partner's 40-group embed into the whole roster.
The longest link is 1,577 characters, SUN's 93 slugs; well inside what browsers carry,
but worth knowing before anyone adds a row with a thousand groups.
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