update db schema

initdb.d/01-function.sql

@@ -1,3 +1,24 @@
+CREATE OR REPLACE FUNCTION "f_updatedAt"()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW."updatedAt" = now();
+    RETURN NEW;
+END;
+$$ language 'plpgsql';
+
 CREATE FUNCTION array_distinct(anyarray) RETURNS anyarray AS $f$
     SELECT array_agg(DISTINCT x) FROM unnest($1) t(x);
 $f$ LANGUAGE SQL IMMUTABLE;
+
+CREATE OR REPLACE FUNCTION normalize_reading (TEXT[]) RETURNS TEXT[] AS
+$func$
+DECLARE
+    s       TEXT;
+    new_arr TEXT[] := '{}';
+BEGIN
+    FOREACH s IN ARRAY $1||'{}'::text[] LOOP
+        new_arr := new_arr||ARRAY[split_part(s,'.',1), replace(s,'.','')];
+    END LOOP;
+    RETURN new_arr;
+END;
+$func$ LANGUAGE plpgsql IMMUTABLE;