diff --git a/mateclaw-server/src/main/resources/db/migration/kingbase/V154__agent_wiki_disabled.sql b/mateclaw-server/src/main/resources/db/migration/kingbase/V154__agent_wiki_disabled.sql
index 72db6127..62c9db24 100644
--- a/mateclaw-server/src/main/resources/db/migration/kingbase/V154__agent_wiki_disabled.sql
+++ b/mateclaw-server/src/main/resources/db/migration/kingbase/V154__agent_wiki_disabled.sql
@@ -1,3 +1,3 @@
 -- V154: Wiki/knowledge-base opt-out flag on mate_agent (issue #304).
 -- Mirrors skills_disabled / tools_disabled. Defaults to FALSE.
-ALTER TABLE mate_agent ADD COLUMN IF NOT EXISTS wiki_disabled SMALLINT NOT NULL DEFAULT 0;
+ALTER TABLE mate_agent ADD COLUMN IF NOT EXISTS wiki_disabled BOOLEAN NOT NULL DEFAULT FALSE;
diff --git a/mateclaw-server/src/main/resources/db/migration/mysql/V154__agent_wiki_disabled.sql b/mateclaw-server/src/main/resources/db/migration/mysql/V154__agent_wiki_disabled.sql
index abb8131d..aa92cf27 100644
--- a/mateclaw-server/src/main/resources/db/migration/mysql/V154__agent_wiki_disabled.sql
+++ b/mateclaw-server/src/main/resources/db/migration/mysql/V154__agent_wiki_disabled.sql
@@ -1,3 +1,17 @@
 -- V154: Wiki/knowledge-base opt-out flag on mate_agent (issue #304).
 -- Mirrors skills_disabled / tools_disabled. Defaults to FALSE.
-ALTER TABLE mate_agent ADD COLUMN IF NOT EXISTS wiki_disabled TINYINT(1) NOT NULL DEFAULT 0;
+-- See the H2 file for context. MySQL 8.0 doesn't support
+-- `ADD COLUMN IF NOT EXISTS`, so the existence check goes through
+-- INFORMATION_SCHEMA + a prepared statement.
+SET @col_exists := (
+    SELECT COUNT(*) FROM information_schema.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'mate_agent'
+      AND COLUMN_NAME = 'wiki_disabled'
+);
+SET @ddl := IF(@col_exists = 0,
+    'ALTER TABLE mate_agent ADD COLUMN wiki_disabled TINYINT(1) NOT NULL DEFAULT 0',
+    'SELECT 1');
+PREPARE stmt FROM @ddl;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;