Add migration table to database.sql

This commit adds a new table called "migration" to the database which
will contain information used for database schema migrations.

The current schema version is 5 because 5 modifications (migrations)
have been applied to the database schema since the initial release.

1 files changed, 7 insertions, 0 deletions

diff --git a/database.sql b/database.sql
index 3f77a3b..ae61034 100644
--- a/database.sql
+++ b/database.sql
@@ -1,4 +1,11 @@
 -- =============================================================================
+-- Internal information table for migrations
+-- =============================================================================
+CREATE TABLE `migration` (`schema_version` smallint(4) NOT NULL)
+	ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+INSERT INTO `migration` (`schema_version`) VALUES (5);
+
+-- =============================================================================
 -- Table structure for page items
 -- =============================================================================
 CREATE TABLE `page` (