fix(tiles): height must be double precision, not numeric

[yorickdewid]

Follow-up to #73, which was merged before this landed.

ST_AsMVT has no MVT value type for numeric and encodes it as a string. Caught by decoding a dynamic tile against its static counterpart at the same z/x/y:

static : "height": 3.25
dynamic: "height": "3.25"

config/layers/incident.json and the four QuickScan facade configs all feed ["get","height"] straight into fill-extrusion-height, which requires a number. Every one of those layers would have rendered flat once the frontends cut over.

building_tiles has always declared height double precision, which is why the buildings source never hit this.

State

Already applied to prod — both tables were dropped and recreated from the corrected files, then repopulated via f/fundermaps/data/refresh_layer_tiles. This PR lands the same state in git so the two don't drift.

 table_name        | column_name | data_type
-------------------+-------------+------------------
 building_tiles    | height      | double precision
 facade_scan_tiles | height      | double precision
 incident_tiles    | height      | double precision

Verification after the fix

Decoded dynamic vs static at facade_scan/14/8365/5444 — identical property set and identical values:

{"external_id":"NL.IMBAG.PAND.1695100000000374","neighborhood_id":"BU16950001",
 "district_id":"WK169500","municipality_id":"GM1695","height":3.25,
 "skewed_parallel_facade":"big","skewed_perpendicular_facade":"small",
 "facade_type":"mediocre","risk":"e"}

Also swept 60 real static tiles across all five sources and compared feature counts. Per-tile counts differ where data clusters on a tile edge (static carries tippecanoe's wider buffer of features that fall outside the tile). To confirm nothing is actually lost, I compared the set of external_ids across a 4×4 z12 block:

static : 487 distinct
dynamic: 487 distinct
in static but not dynamic: 0
in dynamic but not static: 0

So every feature appears in the tile that contains it; the count gaps are buffer duplication only, and match how building_tiles and building_cluster_tiles have behaved in production since July.

🤖 Generated with Claude Code