Markers/landmark nodes missing country/district (legacy edit flow; no parent inheritance) → 'Unknown Country' #4

Severity: low/medium (data accuracy; "Unknown Country" grouping) · Status: open

Symptom

Some markers and landmark nodes have no country (and district) even though it is derivable from their parent city node, so they bucket under "Unknown Country" on /locations and lose the value via COALESCE.

Jerusalem video (lrmE-WiC4eA):

Both landmark nodes' parent city (Jerusalem) has country = Israel — the value is knowable but wasn't carried down. Sibling marker 197 (same video, same city) has it.

Also missing district from the same root flow: markers 13 (Jõhvi/Estonia), 98 (Berat/Albania), 198, 199.

Root cause

1. Legacy from the pre-fix video-edit flow. Before commit 8cd2482 ("Capture and persist country/district when adding video locations") the video-first editor stored only city from the geocode lookup and dropped district/country. Markers 198/199 (and the district-empty rows) were created then; the fix stops new rows but the legacy rows were never backfilled.
2. Landmarks don't inherit the parent city's country/district. createLocation (src/lib/location-matching.ts:147-160) inserts the landmark with whatever country/district was passed and never falls back to the parent city node's values — so a landmark whose marker lacked a country gets NULL even though findOrCreateCity set the parent city's country. (findOrCreateCity self-heals only the city node, L70-79.)
3. Representation mismatch compounds it: the marker side stores '' (see Cleared fields persist as '' instead of NULL (dead Zod empty-string transform) #2 — dead Zod empty-string transform) while the landmark stores NULL.

Fix plan (not done — triage only)

1. Backfill: set country on markers 198/199 and landmarks zqqgo4si/e75wgcw6 from their parent city (Israel); backfill the empty districts where derivable.
2. Code: in createLocation, fall back to the parent city node's country/district when the landmark's own is missing (inherit from parent), mirroring the existing city-node self-heal.
3. Depends on Cleared fields persist as '' instead of NULL (dead Zod empty-string transform) #2 (normalize ''→NULL) and relates to Marker city diverges from its location node's city/name (24 rows) #1 (location nodes are write-once).

Note: this video is about Palestine; if the blank country was an intentional editorial choice rather than a data drop, close as wontfix — but it's currently inconsistent with the sibling stop and the parent city, both of which say "Israel".