CREATE TABLE normals(
    _id INTEGER NOT NULL PRIMARY KEY,
    location_formatted_id TEXT NOT NULL,

    month INTEGER NOT NULL,
    daytime_temperature REAL,
    nighttime_temperature REAL,

    UNIQUE(location_formatted_id, month) ON CONFLICT REPLACE,
    FOREIGN KEY(location_formatted_id) REFERENCES locations (formatted_id)
    ON DELETE CASCADE
);

CREATE INDEX normals_location_formatted_id_index ON normals(location_formatted_id);