Update databases table schema to include pg_version field

internal/database/migrations/20240720055723_add_databases_table.sql

@@ -5,6 +5,7 @@ CREATE TABLE IF NOT EXISTS databases (
 
   name TEXT NOT NULL UNIQUE,
   connection_string TEXT NOT NULL,
+  pg_version TEXT NOT NULL CHECK (pg_version in ('13', '14', '15', '16')),
 
   created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
   updated_at TIMESTAMPTZ

internal/service/databases/create_database.sql

@@ -1,4 +1,8 @@
 -- name: DatabasesServiceCreateDatabase :one
-INSERT INTO databases (name, connection_string)
-VALUES (@name, pgp_sym_encrypt(@connection_string, @encryption_key))
+INSERT INTO databases (
+  name, connection_string, pg_version
+)
+VALUES (
+  @name, pgp_sym_encrypt(@connection_string, @encryption_key), @pg_version
+)
 RETURNING *;

internal/service/databases/update_database.sql

@@ -3,5 +3,6 @@ UPDATE databases
 SET
   name = @name,
   connection_string = pgp_sym_encrypt(@connection_string, @encryption_key)
+  pg_version = @pg_version
 WHERE id = @id
 RETURNING *;