Now using macaddr datatype and added test for adding devices and displaynames

migrations/1_devices.sql

@@ -1,5 +1,5 @@
 -- Add migration script here
 CREATE TABLE Devices (
-    ID CHAR(32) PRIMARY KEY,
+    ID MACADDR PRIMARY KEY,
     display_name VARCHAR(255)
 );

migrations/2_telemetry.sql

@@ -5,6 +5,6 @@ CREATE TABLE Telemetry (
     Voltage FLOAT,
     Temperature FLOAT,
     uptime INT NOT NULL,
-    device_id CHAR(32) NOT NULL,
+    device_id MACADDR NOT NULL,
     FOREIGN KEY (device_id) REFERENCES Devices(ID)
 );

migrations/3_values.sql

@@ -3,7 +3,7 @@ CREATE TABLE Values (
     timestamp TIMESTAMP NOT NULL,
     value FLOAT NOT NULL,
     value_id INT NOT NULL,
-    device_id CHAR(32) NOT NULL,
+    device_id MACADDR NOT NULL,
     active_errors INT NOT NULL,
     FOREIGN KEY (device_id) REFERENCES Devices(ID)
 );