Rust backend setup

backend/migrations/create_airports/down.sql

@@ -0,0 +1 @@
+DROP TABLE airports;

backend/migrations/create_airports/up.sql

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+CREATE TABLE "airports" (
+    id SERIAL PRIMARY KEY,
+    full_name VARCHAR NOT NULL,
+    icao VARCHAR NOT NULL,
+    latitude INT NOT NULL,
+    longitude INT NOT NULL
+)

backend/migrations/create_metars/down.sql

@@ -0,0 +1 @@
+DROP TABLE metars;

backend/migrations/create_metars/up.sql

@@ -0,0 +1,24 @@
+CREATE TABLE "metars" (
+    id SERIAL PRIMARY KEY,
+    icao TEXT NOT NULL,
+    raw_text TEXT NOT NULL,
+    station_id TEXT NOT NULL,
+    observation_time TEXT NOT NULL,
+    latitude INTEGER NOT NULL,
+    longitude INTEGER NOT NULL,
+    temp_c DOUBLE PRECISION NOT NULL,
+    dewpoint_c DOUBLE PRECISION NOT NULL,
+    wind_dir_degrees INTEGER NOT NULL,
+    wind_speed_kt INTEGER NOT NULL,
+    visibility_statute_mi TEXT NOT NULL,
+    altim_in_hg DOUBLE PRECISION NOT NULL,
+    sea_level_pressure_mb DOUBLE PRECISION,
+    wx_string TEXT,
+    flight_category TEXT,
+    three_hr_pressure_tendency_mb DOUBLE PRECISION,
+    metar_type TEXT,
+    max_t_c DOUBLE PRECISION,
+    min_t_c DOUBLE PRECISION,
+    precip_in DOUBLE PRECISION,
+    elevation_m INTEGER
+)

backend/migrations/diesel_initial_setup/down.sql

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+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

backend/migrations/diesel_initial_setup/up.sql

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+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;