Use OSM as the single source of mountain passes

Replace the centcols CSV download/enrichment pipeline with OSM PBF
extraction as the primary (only) source: merge osmpass into mountain_pass,
drop the centcols table and model fields, filter to named passes with
elevation, and remove the centcols CLI flags.

1 files changed, 14 insertions, 0 deletions

diff --git a/db/migrations/20260821000000_osm_only_mountain_passes.sql b/db/migrations/20260821000000_osm_only_mountain_passes.sql
new file mode 100644
index 0000000..ebeed55
--- /dev/null
+++ b/db/migrations/20260821000000_osm_only_mountain_passes.sql
@@ -0,0 +1,14 @@
+-- migrate:up
+drop table mountain_passes;
+alter table osm_passes rename to mountain_passes;
+
+-- migrate:down
+alter table mountain_passes rename to osm_passes;
+create table mountain_passes (
+    id integer primary key,
+    external_id text unique not null,
+    name text not null,
+    country_code text not null,
+    department_code text not null,
+    elevation integer not null
+);