diff --git a/migrations/000005_exercises.down.sql b/migrations/000005_exercises.down.sql
index 711b267..39562da 100644
--- a/migrations/000005_exercises.down.sql
+++ b/migrations/000005_exercises.down.sql
@@ -1,7 +1,22 @@
-DROP TABLE IF EXISTS exercise_variations;
-DROP TABLE IF EXISTS exercise_equipment;
-DROP TABLE IF EXISTS exercise_muscle_groups;
-DROP TABLE IF EXISTS exercises;
-DROP TABLE IF EXISTS equipment;
-DROP TABLE IF EXISTS muscle_groups;
+DROP INDEX IF EXISTS idx_exercise_variations_variation_id;
+DROP INDEX IF EXISTS idx_exercise_variations_exercise_id;
+DROP INDEX IF EXISTS idx_exercise_equipment_equipment_id;
+DROP INDEX IF EXISTS idx_exercise_equipment_exercise_id;
+DROP INDEX IF EXISTS idx_exercise_muscle_groups_muscle_group_id;
+DROP INDEX IF EXISTS idx_exercise_muscle_groups_exercise_id;
+DROP INDEX IF EXISTS idx_equipment_name;
+DROP INDEX IF EXISTS idx_equipment_wger_id;
+DROP INDEX IF EXISTS idx_muscle_groups_name;
+DROP INDEX IF EXISTS idx_muscle_groups_wger_id;
+DROP INDEX IF EXISTS idx_exercises_expires_at;
+DROP INDEX IF EXISTS idx_exercises_cached_at;
+DROP INDEX IF EXISTS idx_exercises_name;
+DROP INDEX IF EXISTS idx_exercises_category;
+DROP INDEX IF EXISTS idx_exercises_wger_id;
 
+DROP TABLE IF EXISTS exercise_variations CASCADE;
+DROP TABLE IF EXISTS exercise_equipment CASCADE;
+DROP TABLE IF EXISTS exercise_muscle_groups CASCADE;
+DROP TABLE IF EXISTS exercises CASCADE;
+DROP TABLE IF EXISTS equipment CASCADE;
+DROP TABLE IF EXISTS muscle_groups CASCADE;
diff --git a/migrations/000005_exercises.up.sql b/migrations/000005_exercises.up.sql
index 1644321..d40f000 100644
--- a/migrations/000005_exercises.up.sql
+++ b/migrations/000005_exercises.up.sql
@@ -1,4 +1,4 @@
-CREATE TABLE muscle_groups (
+CREATE TABLE IF NOT EXISTS muscle_groups (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     wger_id INTEGER NOT NULL UNIQUE,
     name VARCHAR(100) NOT NULL,
@@ -8,7 +8,20 @@ CREATE TABLE muscle_groups (
     updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
 );
 
-CREATE TABLE equipment (
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'muscle_groups' AND column_name = 'exercise_db_id') THEN
+        ALTER TABLE muscle_groups RENAME COLUMN exercise_db_id TO wger_id;
+    END IF;
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'muscle_groups' AND column_name = 'name_en') THEN
+        ALTER TABLE muscle_groups ADD COLUMN name_en VARCHAR(100) NOT NULL DEFAULT '';
+    END IF;
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'muscle_groups' AND column_name = 'is_front') THEN
+        ALTER TABLE muscle_groups ADD COLUMN is_front BOOLEAN NOT NULL DEFAULT true;
+    END IF;
+END $$;
+
+CREATE TABLE IF NOT EXISTS equipment (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     wger_id INTEGER NOT NULL UNIQUE,
     name VARCHAR(100) NOT NULL,
@@ -16,7 +29,14 @@ CREATE TABLE equipment (
     updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
 );
 
-CREATE TABLE exercises (
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'equipment' AND column_name = 'exercise_db_id') THEN
+        ALTER TABLE equipment RENAME COLUMN exercise_db_id TO wger_id;
+    END IF;
+END $$;
+
+CREATE TABLE IF NOT EXISTS exercises (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     wger_id INTEGER NOT NULL UNIQUE,
     wger_uuid VARCHAR(255) NOT NULL DEFAULT '',
@@ -33,7 +53,42 @@ CREATE TABLE exercises (
     updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
 );
 
-CREATE TABLE exercise_muscle_groups (
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'exercise_db_id') THEN
+        ALTER TABLE exercises RENAME COLUMN exercise_db_id TO wger_id;
+    END IF;
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'wger_uuid') THEN
+        ALTER TABLE exercises ADD COLUMN wger_uuid VARCHAR(255) NOT NULL DEFAULT '';
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'instructions') THEN
+        ALTER TABLE exercises DROP COLUMN instructions;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'tips') THEN
+        ALTER TABLE exercises DROP COLUMN tips;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'status') THEN
+        ALTER TABLE exercises DROP COLUMN status;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'name_original') THEN
+        ALTER TABLE exercises DROP COLUMN name_original;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'uuid') THEN
+        ALTER TABLE exercises DROP COLUMN uuid;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'description') THEN
+        ALTER TABLE exercises ALTER COLUMN description TYPE TEXT;
+        ALTER TABLE exercises ALTER COLUMN description SET NOT NULL;
+        ALTER TABLE exercises ALTER COLUMN description SET DEFAULT '';
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'exercises' AND column_name = 'license_author') THEN
+        ALTER TABLE exercises ALTER COLUMN license_author TYPE VARCHAR(255);
+        ALTER TABLE exercises ALTER COLUMN license_author SET NOT NULL;
+        ALTER TABLE exercises ALTER COLUMN license_author SET DEFAULT '';
+    END IF;
+END $$;
+
+CREATE TABLE IF NOT EXISTS exercise_muscle_groups (
     exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
     muscle_group_id UUID NOT NULL REFERENCES muscle_groups(id) ON DELETE CASCADE,
     is_primary BOOLEAN NOT NULL DEFAULT true,
@@ -41,39 +96,52 @@ CREATE TABLE exercise_muscle_groups (
     PRIMARY KEY (exercise_id, muscle_group_id, is_primary)
 );
 
-CREATE TABLE exercise_equipment (
+CREATE TABLE IF NOT EXISTS exercise_equipment (
     exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
     equipment_id UUID NOT NULL REFERENCES equipment(id) ON DELETE CASCADE,
     created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
     PRIMARY KEY (exercise_id, equipment_id)
 );
 
-CREATE TABLE exercise_variations (
-    exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
-    variation_exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
-    PRIMARY KEY (exercise_id, variation_exercise_id),
-    CHECK (exercise_id != variation_exercise_id)
-);
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'exercise_alternatives') THEN
+        ALTER TABLE exercise_alternatives RENAME TO exercise_variations;
+        ALTER TABLE exercise_variations RENAME COLUMN alternative_exercise_id TO variation_exercise_id;
+    ELSE
+        CREATE TABLE IF NOT EXISTS exercise_variations (
+            exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
+            variation_exercise_id UUID NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
+            created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+            PRIMARY KEY (exercise_id, variation_exercise_id),
+            CHECK (exercise_id != variation_exercise_id)
+        );
+    END IF;
+END $$;
 
-CREATE INDEX idx_exercises_wger_id ON exercises(wger_id);
-CREATE INDEX idx_exercises_category ON exercises(category);
-CREATE INDEX idx_exercises_name ON exercises(name);
-CREATE INDEX idx_exercises_cached_at ON exercises(cached_at);
-CREATE INDEX idx_exercises_expires_at ON exercises(expires_at);
+DROP INDEX IF EXISTS idx_exercises_exercise_db_id;
+DROP INDEX IF EXISTS idx_muscle_groups_exercise_db_id;
+DROP INDEX IF EXISTS idx_equipment_exercise_db_id;
+DROP INDEX IF EXISTS idx_exercise_alternatives_exercise_id;
+DROP INDEX IF EXISTS idx_exercise_alternatives_alternative_id;
 
-CREATE INDEX idx_muscle_groups_wger_id ON muscle_groups(wger_id);
-CREATE INDEX idx_muscle_groups_name ON muscle_groups(name);
+CREATE INDEX IF NOT EXISTS idx_exercises_wger_id ON exercises(wger_id);
+CREATE INDEX IF NOT EXISTS idx_exercises_category ON exercises(category);
+CREATE INDEX IF NOT EXISTS idx_exercises_name ON exercises(name);
+CREATE INDEX IF NOT EXISTS idx_exercises_cached_at ON exercises(cached_at);
+CREATE INDEX IF NOT EXISTS idx_exercises_expires_at ON exercises(expires_at);
 
-CREATE INDEX idx_equipment_wger_id ON equipment(wger_id);
-CREATE INDEX idx_equipment_name ON equipment(name);
+CREATE INDEX IF NOT EXISTS idx_muscle_groups_wger_id ON muscle_groups(wger_id);
+CREATE INDEX IF NOT EXISTS idx_muscle_groups_name ON muscle_groups(name);
 
-CREATE INDEX idx_exercise_muscle_groups_exercise_id ON exercise_muscle_groups(exercise_id);
-CREATE INDEX idx_exercise_muscle_groups_muscle_group_id ON exercise_muscle_groups(muscle_group_id);
+CREATE INDEX IF NOT EXISTS idx_equipment_wger_id ON equipment(wger_id);
+CREATE INDEX IF NOT EXISTS idx_equipment_name ON equipment(name);
 
-CREATE INDEX idx_exercise_equipment_exercise_id ON exercise_equipment(exercise_id);
-CREATE INDEX idx_exercise_equipment_equipment_id ON exercise_equipment(equipment_id);
+CREATE INDEX IF NOT EXISTS idx_exercise_muscle_groups_exercise_id ON exercise_muscle_groups(exercise_id);
+CREATE INDEX IF NOT EXISTS idx_exercise_muscle_groups_muscle_group_id ON exercise_muscle_groups(muscle_group_id);
 
-CREATE INDEX idx_exercise_variations_exercise_id ON exercise_variations(exercise_id);
-CREATE INDEX idx_exercise_variations_variation_id ON exercise_variations(variation_exercise_id);
+CREATE INDEX IF NOT EXISTS idx_exercise_equipment_exercise_id ON exercise_equipment(exercise_id);
+CREATE INDEX IF NOT EXISTS idx_exercise_equipment_equipment_id ON exercise_equipment(equipment_id);
 
+CREATE INDEX IF NOT EXISTS idx_exercise_variations_exercise_id ON exercise_variations(exercise_id);
+CREATE INDEX IF NOT EXISTS idx_exercise_variations_variation_id ON exercise_variations(variation_exercise_id);