fix: updated table name 'sessions' => 'refresh_tokens'

internal/database/migrations/000001_create_users.down.sql

@@ -1,2 +1,2 @@
-DROP TABLE IF EXISTS sessions;
+DROP TABLE IF EXISTS refresh_tokens;
 DROP TABLE IF EXISTS users;

internal/database/migrations/000001_create_users.up.sql

@@ -6,11 +6,13 @@ CREATE TABLE IF NOT EXISTS users (
     created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
-CREATE TABLE IF NOT EXISTS sessions (
+CREATE TABLE IF NOT EXISTS refresh_tokens (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
-    token_id UUID UNIQUE NOT NULL,
+    token_hash VARCHAR(64) UNIQUE NOT NULL,
     is_revoked BOOLEAN NOT NULL DEFAULT FALSE,
     expires_at TIMESTAMPTZ NOT NULL,
     created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
+
+CREATE INDEX idx_refresh_tokens_hash ON refresh_tokens(token_hash);