add migrations for poll votes

Author: nevzattalhaozcan

internal/database/connection.go

@@ -90,6 +90,7 @@ func autoMigrate(db *gorm.DB) error {
 		models.CommentLike{},
 		models.Post{},
 		models.PostLike{},
+		models.PollVote{},
 		models.UserBookProgress{},
 		models.ClubBookAssignment{},
 		models.ReadingLog{},

internal/database/migrations/000009_create_poll_votes_table.down.sql

@@ -0,0 +1,4 @@
+DROP INDEX IF EXISTS idx_poll_votes_option_id;
+DROP INDEX IF EXISTS idx_poll_votes_user_id;
+DROP INDEX IF EXISTS idx_poll_votes_post_id;
+DROP TABLE IF EXISTS poll_votes;

internal/database/migrations/000009_create_poll_votes_table.up.sql

@@ -0,0 +1,13 @@
+CREATE TABLE poll_votes (
+    id SERIAL PRIMARY KEY,
+    post_id INTEGER NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    option_id VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    UNIQUE(post_id, user_id, option_id)
+);
+
+CREATE INDEX idx_poll_votes_post_id ON poll_votes(post_id);
+CREATE INDEX idx_poll_votes_user_id ON poll_votes(user_id);
+CREATE INDEX idx_poll_votes_option_id ON poll_votes(option_id);