[test][db] added sql test files for quicker tests

db/pyheatpump.test.sql

+CREATE TABLE IF NOT EXISTS var_type (
+  slabel CHAR(1) UNIQUE PRIMARY KEY,
+  label VARCHAR(10) UNIQUE,
+  type VARCHAR(10) NOT NULL,
+  start_address INT NOT NULL DEFAULT 0,
+  end_address INT NOT NULL DEFAULT 250
+);
+
+CREATE TABLE IF NOT EXISTS variable (
+  type CHAR(1) NOT NULL,
+  address INT NOT NULL,
+  unit VARCHAR(5) NULL,
+  last_update INT NULL,
+
+
+  FOREIGN KEY (type) REFERENCES var_type(slabel)
+    ON DELETE CASCADE,
+  PRIMARY KEY(type, address)
+);
+
+CREATE TABLE IF NOT EXISTS var_value (
+  type CHAR(1) NOT NULL,
+  address INT NOT NULL,
+  time INT DEFAULT CURRENT_TIMESTAMP,
+  value INT NOT NULL,
+
+  FOREIGN KEY (type) REFERENCES variable(type)
+    ON DELETE CASCADE,
+  FOREIGN KEY (address) REFERENCES variable(address)
+    ON DELETE CASCADE,
+  PRIMARY KEY(type, address, time)
+);
+
+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
+  'A', 'Analog', 'float', 1, 125);
+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
+  'I', 'Integer', 'int', 5002, 5002 + 125);
+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
+  'D', 'Digital', 'bool', 1, 125);
+
+CREATE TRIGGER variable_insert BEFORE INSERT ON var_value
+FOR EACH ROW
+WHEN
+  NOT EXISTS (
+    SELECT MAX(time) FROM var_value
+    WHERE
+      NEW.type = type
+      AND
+      NEW.address = address
+      AND
+      NEW.value = value
+  )
+BEGIN
+  INSERT INTO var_value
+  (type, address, value)
+  VALUES (NEW.type, NEW.address, NEW.value);
+END;
+
+CREATE TRIGGER variable_last_update AFTER INSERT ON var_value
+FOR EACH ROW
+BEGIN
+  UPDATE variable
+  SET last_update = NEW.time
+  WHERE
+    type = NEW.type
+    AND
+    address = NEW.address;
+END;

db/test_variable_values_wo_time.sql

+INSERT INTO var_value (type, address, value) VALUES
+('A', 10, 42),
+('A', 11, 24),
+('I', 5010, 42),
+('I', 5011, 24),
+('D', 10, 1),
+('D', 11, 1)