fix: modify insert daily activity function to handle kolibri time delta

backend/migrations/00014_make_drop_create_insert_daily_activity.sql

@@ -0,0 +1,50 @@
+-- +goose Up
+-- +goose StatementBegin
+drop function if exists
+    public.insert_daily_activity(
+       integer, integer, character varying, integer, character varying
+);
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+create function
+    public.insert_daily_activity(
+        _user_id integer,
+        _course_id integer,
+        _type character varying,
+        _total_time integer,
+        _external_id character varying
+    )
+returns void
+language plpgsql
+as 
+'
+    DECLARE prev_total_time INT;
+    DECLARE provider_type CHAR ( 100 );
+    BEGIN
+        select p.type INTO provider_type from activities a 
+        inner join courses c on c.id = a.course_id 
+                and c.deleted_at IS NULL
+        inner join provider_platforms p on p.id = c.provider_platform_id
+                and p.deleted_at IS NULL
+        where a.user_id = _user_id AND a.course_id = _course_id
+        LIMIT 1;
+        SELECT total_time INTO prev_total_time FROM activities
+        WHERE user_id = _user_id AND course_id = _course_id
+        ORDER BY created_at DESC LIMIT 1;
+        IF prev_total_time IS NULL THEN
+            prev_total_time := 0;
+        END IF;
+        --kolibri total_time is the delta and total_time 
+        --is required to be added to previous_total_time 
+        IF provider_type = ''kolibri'' THEN
+                INSERT INTO activities (user_id, course_id, type, total_time, time_delta, external_id, created_at, updated_at)
+                VALUES (_user_id, _course_id, _type, _total_time + prev_total_time, _total_time, _external_id, NOW(), NOW());
+        ELSE
+                INSERT INTO activities (user_id, course_id, type, total_time, time_delta, external_id, created_at, updated_at)
+                VALUES (_user_id, _course_id, _type, _total_time, _total_time - prev_total_time, _external_id, NOW(), NOW());
+        END IF;
+    END;
+'
+;-- +goose StatementEnd