Add ALTER TABLE migration for auto_signup column on existing ClickHouse

The CREATE TABLE IF NOT EXISTS won't add new columns to an existing table.
Add 05-oidc-auto-signup.sql with ALTER TABLE ADD COLUMN IF NOT EXISTS and
register it in ClickHouseConfig startup schema + test init.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/ClickHouseConfig.java

@@ -27,7 +27,8 @@ public class ClickHouseConfig {
     private static final Logger log = LoggerFactory.getLogger(ClickHouseConfig.class);
     private static final String[] SCHEMA_FILES = {
             "clickhouse/01-schema.sql", "clickhouse/02-search-columns.sql",
-            "clickhouse/03-users.sql", "clickhouse/04-oidc-config.sql"
+            "clickhouse/03-users.sql", "clickhouse/04-oidc-config.sql",
+            "clickhouse/05-oidc-auto-signup.sql"
     };
 
     private final DataSource dataSource;

cameleer3-server-app/src/main/resources/clickhouse/04-oidc-config.sql

@@ -6,6 +6,7 @@ CREATE TABLE IF NOT EXISTS oidc_config (
     client_secret  String DEFAULT '',
     roles_claim    String DEFAULT 'realm_access.roles',
     default_roles  Array(LowCardinality(String)),
+    auto_signup    Bool DEFAULT true,
     updated_at     DateTime64(3, 'UTC') DEFAULT now64(3, 'UTC')
 ) ENGINE = ReplacingMergeTree(updated_at)
 ORDER BY (config_id);

cameleer3-server-app/src/main/resources/clickhouse/05-oidc-auto-signup.sql

@@ -0,0 +1 @@
+ALTER TABLE oidc_config ADD COLUMN IF NOT EXISTS auto_signup Bool DEFAULT true;

cameleer3-server-app/src/test/java/com/cameleer3/server/app/AbstractClickHouseIT.java

@@ -56,7 +56,7 @@ public abstract class AbstractClickHouseIT {
         }
 
         // Load all schema files in order
-        String[] schemaFiles = {"01-schema.sql", "02-search-columns.sql", "03-users.sql", "04-oidc-config.sql"};
+        String[] schemaFiles = {"01-schema.sql", "02-search-columns.sql", "03-users.sql", "04-oidc-config.sql", "05-oidc-auto-signup.sql"};
 
         try (Connection conn = DriverManager.getConnection(
                 CLICKHOUSE.getJdbcUrl(),

clickhouse/init/05-oidc-auto-signup.sql

@@ -0,0 +1 @@
+ALTER TABLE oidc_config ADD COLUMN IF NOT EXISTS auto_signup Bool DEFAULT true;