Updated metar querying logic and parsing

service/migrations/000001_metars/up.sql

@@ -1,6 +1,6 @@
 CREATE TABLE IF NOT EXISTS metars (
   id INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
-  station_id TEXT NOT NULL,
+  icao TEXT NOT NULL,
   observation_time TIMESTAMP NOT NULL,
   raw_text TEXT NOT NULL,
   data JSONB NOT NULL