Index: db-scripts/ddl.sql
===================================================================
--- db-scripts/ddl.sql	(revision c4c43f36be9f46e4a3e8aaf7198b6db598eb6d5d)
+++ db-scripts/ddl.sql	(revision 37307aadda57d1e5b86180b9b2b8a6318ec36095)
@@ -21,6 +21,6 @@
 CREATE TABLE USERS (
     user_id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
-    email TEXT NOT NULL,
-    username TEXT NOT NULL,
+    email TEXT NOT NULL UNIQUE,
+    username TEXT NOT NULL UNIQUE,
     password TEXT NOT NULL
 );
Index: db-scripts/dml.sql
===================================================================
--- db-scripts/dml.sql	(revision c4c43f36be9f46e4a3e8aaf7198b6db598eb6d5d)
+++ db-scripts/dml.sql	(revision 37307aadda57d1e5b86180b9b2b8a6318ec36095)
@@ -2,14 +2,14 @@
 
 INSERT INTO USERS (user_id, email, username, password) VALUES
-(1, 'dimitar@example.com', 'dimitar_arsov', '$2a$10$examplehash1'),
-(2, 'filip@example.com', 'filip_gavrilovski', '$2a$10$examplehash2'),
-(3, 'marko@example.com', 'marko_markovski', '$2a$10$examplehash3'),
+(1, 'dimitar@example.com', 'dimitar_arsov', '1234'),
+(2, 'filip@example.com', 'filip_gavrilovski', '1234'),
+(3, 'marko@example.com', 'marko_markovski', '1234'),
 (4, 'andrej.shumanovski@gmail.com', 'andrej_shumanovski', '1234'),
 (5, 'angelovski.mario222@gmail.com', 'angelovski_mario', '1234'),
-(6, 'ana@example.com', 'ana_ilievska', '$2a$10$examplehash6'),
-(7, 'petar@example.com', 'petar_stojanov', '$2a$10$examplehash7'),
-(8, 'elena@example.com', 'elena_ristova', '$2a$10$examplehash8'),
-(9, 'stefan@example.com', 'stefan_nikolov', '$2a$10$examplehash9'),
-(10, 'ivana@example.com', 'ivana_karapandzova', '$2a$10$examplehash10'),
+(6, 'ana@example.com', 'ana_ilievska', '1234'),
+(7, 'petar@example.com', 'petar_stojanov', '1234'),
+(8, 'elena@example.com', 'elena_ristova', '1234'),
+(9, 'stefan@example.com', 'stefan_nikolov', '1234'),
+(10, 'ivana@example.com', 'ivana_karapandzova', '1234'),
 (11, 'nikola@example.com', 'nikola_ivanov', '1234'),
 (12, 'marija@example.com', 'marija_petrova', '1234'),
@@ -193,28 +193,28 @@
 
 INSERT INTO TRAINING_SESSIONS (training_id, training_user_id, duration, calories, date, type) VALUES
-(1, 1, 60, 500, '2026-02-01', 'Running'),
-(2, 2, 45, 400, '2026-02-01', 'Cycling'),
-(3, 3, 30, 300, '2026-02-01', 'Swimming'),
-(4, 4, 50, 420, '2026-02-02', 'HIIT'),
-(5, 5, 40, 350, '2026-02-02', 'Strength'),
-(6, 6, 35, 280, '2026-02-02', 'Yoga'),
-(7, 7, 55, 520, '2026-02-03', 'Running'),
-(8, 8, 45, 390, '2026-02-03', 'Cycling'),
-(9, 9, 30, 260, '2026-02-03', 'Rowing'),
-(10, 10, 60, 480, '2026-02-04', 'Swimming'),
-(11, 11, 50, 430, '2026-02-05', 'Strength'),
-(12, 12, 40, 310, '2026-02-05', 'Yoga'),
-(13, 13, 60, 540, '2026-02-06', 'Running'),
-(14, 14, 35, 260, '2026-02-06', 'Pilates'),
-(15, 15, 45, 390, '2026-02-07', 'Cycling'),
-(16, 16, 55, 460, '2026-02-07', 'HIIT'),
-(17, 17, 30, 240, '2026-02-08', 'Rowing'),
-(18, 18, 65, 520, '2026-02-08', 'Swimming'),
-(19, 19, 50, 440, '2026-02-09', 'Running'),
-(20, 20, 45, 370, '2026-02-09', 'Strength'),
-(21, 11, 35, 300, '2026-02-12', 'Cycling'),
-(22, 13, 30, 260, '2026-02-12', 'Core'),
-(23, 15, 70, 600, '2026-02-13', 'Long Run'),
-(24, 17, 40, 320, '2026-02-13', 'Strength');
+(1, 1, 60, 500, '2026-02-01', 'running'),
+(2, 2, 45, 400, '2026-02-01', 'cycling'),
+(3, 3, 30, 300, '2026-02-01', 'swimming'),
+(4, 4, 50, 420, '2026-02-02', 'hiit'),
+(5, 5, 40, 350, '2026-02-02', 'strength'),
+(6, 6, 35, 280, '2026-02-02', 'yoga'),
+(7, 7, 55, 520, '2026-02-03', 'running'),
+(8, 8, 45, 390, '2026-02-03', 'cycling'),
+(9, 9, 30, 260, '2026-02-03', 'rowing'),
+(10, 10, 60, 480, '2026-02-04', 'swimming'),
+(11, 11, 50, 430, '2026-02-05', 'strength'),
+(12, 12, 40, 310, '2026-02-05', 'yoga'),
+(13, 13, 60, 540, '2026-02-06', 'running'),
+(14, 14, 35, 260, '2026-02-06', 'pilates'),
+(15, 15, 45, 390, '2026-02-07', 'cycling'),
+(16, 16, 55, 460, '2026-02-07', 'hiit'),
+(17, 17, 30, 240, '2026-02-08', 'rowing'),
+(18, 18, 65, 520, '2026-02-08', 'swimming'),
+(19, 19, 50, 440, '2026-02-09', 'running'),
+(20, 20, 45, 370, '2026-02-09', 'strength'),
+(21, 11, 35, 300, '2026-02-12', 'cycling'),
+(22, 13, 30, 260, '2026-02-12', 'strength'),
+(23, 15, 70, 600, '2026-02-13', 'running'),
+(24, 17, 40, 320, '2026-02-13', 'strength');
 
 SELECT setval(