diff --git a/Makefile b/Makefile
index 43403f4..96a6164 100644
--- a/Makefile
+++ b/Makefile
@@ -25,6 +25,7 @@ seed-demo:
 	@echo "Applying migrations and seeding demo data..."
 	@DB_PATH=$${DATABASE_URL:-sqlite:data/attendance.db}; \
 	DB_FILE=$${DB_PATH#sqlite:}; \
+	rm -f $$DB_FILE; \
 	for f in backend/migrations/*.sql; do \
 		echo "Applying $$f..."; \
 		sqlite3 $$DB_FILE < $$f; \
diff --git a/backend/migrations/001_initial.sql b/backend/migrations/001_initial.sql
index 7d9ecfd..d099b28 100644
--- a/backend/migrations/001_initial.sql
+++ b/backend/migrations/001_initial.sql
@@ -1,35 +1,35 @@
-CREATE TABLE IF NOT EXISTS courses (
+CREATE TABLE courses (
     id       INTEGER PRIMARY KEY,
     name     TEXT NOT NULL,
     semester TEXT NOT NULL
 );
 
-CREATE TABLE IF NOT EXISTS tutors (
+CREATE TABLE tutors (
     id            INTEGER PRIMARY KEY,
     name          TEXT NOT NULL,
     email         TEXT UNIQUE NOT NULL,
     password_hash TEXT NOT NULL
 );
 
-CREATE TABLE IF NOT EXISTS tutor_courses (
+CREATE TABLE tutor_courses (
     tutor_id  INTEGER NOT NULL REFERENCES tutors(id),
     course_id INTEGER NOT NULL REFERENCES courses(id),
     PRIMARY KEY (tutor_id, course_id)
 );
 
-CREATE TABLE IF NOT EXISTS students (
+CREATE TABLE students (
     id        INTEGER PRIMARY KEY,
     course_id INTEGER NOT NULL REFERENCES courses(id),
     name      TEXT NOT NULL
 );
 
-CREATE TABLE IF NOT EXISTS rooms (
+CREATE TABLE rooms (
     id          INTEGER PRIMARY KEY,
     name        TEXT NOT NULL,
     layout_json TEXT NOT NULL
 );
 
-CREATE TABLE IF NOT EXISTS sessions (
+CREATE TABLE sessions (
     id        INTEGER PRIMARY KEY,
     course_id INTEGER NOT NULL REFERENCES courses(id),
     week_nr   INTEGER NOT NULL,
@@ -37,7 +37,7 @@ CREATE TABLE IF NOT EXISTS sessions (
     UNIQUE(course_id, week_nr)
 );
 
-CREATE TABLE IF NOT EXISTS slots (
+CREATE TABLE slots (
     id         INTEGER PRIMARY KEY,
     session_id INTEGER NOT NULL REFERENCES sessions(id),
     room_id    INTEGER REFERENCES rooms(id),
@@ -48,7 +48,7 @@ CREATE TABLE IF NOT EXISTS slots (
     code       TEXT UNIQUE
 );
 
-CREATE TABLE IF NOT EXISTS attendances (
+CREATE TABLE attendances (
     id            INTEGER PRIMARY KEY,
     slot_id       INTEGER NOT NULL REFERENCES slots(id),
     student_id    INTEGER NOT NULL REFERENCES students(id),
@@ -58,7 +58,7 @@ CREATE TABLE IF NOT EXISTS attendances (
     UNIQUE(slot_id, seat_id)
 );
 
-CREATE TABLE IF NOT EXISTS notes (
+CREATE TABLE notes (
     id         INTEGER PRIMARY KEY,
     slot_id    INTEGER NOT NULL REFERENCES slots(id),
     student_id INTEGER NOT NULL REFERENCES students(id),
@@ -69,11 +69,11 @@ CREATE TABLE IF NOT EXISTS notes (
 );
 
 -- Indexes on high-frequency FK columns (SQLite does not auto-index FKs)
-CREATE INDEX IF NOT EXISTS idx_students_course     ON students(course_id);
-CREATE INDEX IF NOT EXISTS idx_sessions_course     ON sessions(course_id);
-CREATE INDEX IF NOT EXISTS idx_slots_session       ON slots(session_id);
-CREATE INDEX IF NOT EXISTS idx_slots_tutor         ON slots(tutor_id);
-CREATE INDEX IF NOT EXISTS idx_attendances_slot    ON attendances(slot_id);
-CREATE INDEX IF NOT EXISTS idx_attendances_student ON attendances(student_id);
-CREATE INDEX IF NOT EXISTS idx_notes_slot          ON notes(slot_id);
-CREATE INDEX IF NOT EXISTS idx_notes_student       ON notes(student_id);
+CREATE INDEX idx_students_course     ON students(course_id);
+CREATE INDEX idx_sessions_course     ON sessions(course_id);
+CREATE INDEX idx_slots_session       ON slots(session_id);
+CREATE INDEX idx_slots_tutor         ON slots(tutor_id);
+CREATE INDEX idx_attendances_slot    ON attendances(slot_id);
+CREATE INDEX idx_attendances_student ON attendances(student_id);
+CREATE INDEX idx_notes_slot          ON notes(slot_id);
+CREATE INDEX idx_notes_student       ON notes(student_id);