HB, OTA etc

db/migrations/V4__telemetry_units.sql

@@ -0,0 +1,16 @@
+alter TABLE telemetry
+add defective boolean default false,
+add defective_reason varchar(64);
+
+alter TABLE telemetry_data ADD 
+unit varchar (16);
+
+create table units (
+    unit varchar(16) not null,
+    target_unit varchar(16) not null,
+    multiplier double not null,
+    primary key (unit)
+);
+
+insert into units (unit, target_unit, multiplier) 
+values ('c_x100', 'c', 0.01);