fix(db): correct migration history and fix timestamp nullability

Author: rkonoplev

…igration/V12__Create_Homepage_Blocks.sql …n/common/V12__Create_Homepage_Blocks.sqlbackend/src/main/resources/db/migration/V12__Create_Homepage_Blocks.sql renamed to backend/src/main/resources/db/migration/common/V12__Create_Homepage_Blocks.sql backend/src/main/resources/db/migration/V12__Create_Homepage_Blocks.sql renamed to backend/src/main/resources/db/migration/common/V12__Create_Homepage_Blocks.sql

@@ -1,18 +0,0 @@
--- V12: Make Timestamps Not Nullable
--- This script updates the content table to ensure created_at and updated_at are not nullable,
--- aligning the schema with the entity validation rules.
-
--- First, update existing null values to a sensible default (e.g., the publication_date)
--- to avoid errors when applying the NOT NULL constraint.
-UPDATE content
-SET created_at = publication_date,
-    updated_at = publication_date
-WHERE created_at IS NULL
-   OR updated_at IS NULL;
-
--- Now, alter the table to enforce the NOT NULL constraint.
--- The exact syntax can vary between database systems (e.g., MySQL vs. PostgreSQL).
--- This syntax is generally compatible with MySQL.
-ALTER TABLE content
-    MODIFY COLUMN created_at DATETIME NOT NULL,
-    MODIFY COLUMN updated_at DATETIME NOT NULL;

backend/src/main/resources/db/migration/common/V12__make_timestamps_not_nullable.sql

@@ -0,0 +1,18 @@
+-- V13: Make Timestamps Not Nullable
+-- This script updates the content table to ensure created_at and updated_at are not nullable,
+-- aligning the schema with the entity validation rules.
+
+-- First, update existing null values to a sensible default (e.g., the publication_date)
+-- to avoid errors when applying the NOT NULL constraint.
+UPDATE content
+SET created_at = publication_date,
+    updated_at = publication_date
+WHERE created_at IS NULL
+   OR updated_at IS NULL;
+
+-- Now, alter the table to enforce the NOT NULL constraint.
+-- The exact syntax can vary between database systems (e.g., MySQL vs. PostgreSQL).
+-- This syntax is generally compatible with MySQL.
+ALTER TABLE content
+    MODIFY COLUMN created_at DATETIME NOT NULL,
+    MODIFY COLUMN updated_at DATETIME NOT NULL;