fix: Enhance SQL Scripts🫸🌀✏️📗🐧🐳⬆

Author: hendisantika

src/main/resources/db/migration/V3_20241101_0722__Create_BookInstances_Table.sql

@@ -1,6 +1,6 @@
-CREATE TABLE BookInstances (
+CREATE TABLE book_instances (
                                instance_id bigserial PRIMARY KEY,
-                               book_id INT REFERENCES Books(book_id),
+                               book_id BIGINT REFERENCES Books(book_id),
                                status VARCHAR(20) CHECK (status IN ('available', 'checked_out', 'reserved')) NOT NULL,
                                due_date DATE,
                                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP

src/main/resources/db/migration/V4_20241101_0724__Create_Checkouts_Table.sql

@@ -1,7 +1,7 @@
 CREATE TABLE Checkouts (
                            checkout_id bigserial PRIMARY KEY,
-                           user_id INT REFERENCES Users(user_id),
-                           instance_id INT REFERENCES BookInstances(instance_id),
+                           user_id BIGINT REFERENCES Users(user_id),
+                           instance_id BIGINT REFERENCES book_instances(instance_id),
                            checkout_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                            return_date TIMESTAMP
 );

src/main/resources/db/migration/V5_20241101_0725__Init_Table_Data.sql

@@ -10,7 +10,7 @@ INSERT INTO Books (title, author, isbn, published_date, genre) VALUES
                                                                    ('1984', 'George Orwell', '9780451524935', '1949-06-08', 'Dystopian');
 
 -- Insert Book Instances
-INSERT INTO BookInstances (book_id, status, due_date) VALUES
+INSERT INTO book_instances (book_id, status, due_date) VALUES
                                                           (1, 'available', NULL),
                                                           (1, 'checked_out', '2024-07-15'),
                                                           (2, 'available', NULL),