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
    RETURN ARRAY[split_part($1,'.',1), replace($1,'.','')];
END;
$func$ LANGUAGE plpgsql IMMUTABLE;

CREATE OR REPLACE FUNCTION identity (JSONB) RETURNS JSONB AS
$func$
SELECT $1;
$func$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION identity (TEXT) RETURNS TEXT AS
$func$
SELECT $1;
$func$ LANGUAGE SQL IMMUTABLE;