change db types for better handling

service_a/server/database/migrations/001_data.up.sql

@@ -1,14 +1,16 @@
+create extension citext; -- noqa
+
 create table public.meteo_data
 (
     id serial primary key,
 
     location_name citext not null,
-    max_temp float not null,
-    min_temp float not null,
-    rainfall float not null,
-    cloudiness float not null,
+    max_temp numeric(5,2) not null,
+    min_temp numeric(5,2) not null,
+    rainfall numeric(5,2) not null,
+    cloudiness int not null,
 
-    created_at timestamp not null default now()
+    created_at date not null default now()
 );
 
 create index idx_meteo_data_location_name on public.meteo_data (location_name);