diff --git a/ai_knowledge_base_v2/apps/backend/alembic/versions/0006_expand_ai_request_log_text.py b/ai_knowledge_base_v2/apps/backend/alembic/versions/0006_expand_ai_request_log_text.py
new file mode 100644
index 0000000..4d1b767
--- /dev/null
+++ b/ai_knowledge_base_v2/apps/backend/alembic/versions/0006_expand_ai_request_log_text.py
@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+revision = "0006_expand_ai_request_log_text"
+down_revision = "0005_chat_session_summary"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.alter_column(
+        "sys_ai_request_log",
+        "prompt",
+        existing_type=sa.Text(),
+        type_=mysql.MEDIUMTEXT(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "sys_ai_request_log",
+        "retrieved_chunks",
+        existing_type=sa.Text(),
+        type_=mysql.MEDIUMTEXT(),
+        existing_nullable=True,
+    )
+
+
+def downgrade() -> None:
+    op.alter_column(
+        "sys_ai_request_log",
+        "retrieved_chunks",
+        existing_type=mysql.MEDIUMTEXT(),
+        type_=sa.Text(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "sys_ai_request_log",
+        "prompt",
+        existing_type=mysql.MEDIUMTEXT(),
+        type_=sa.Text(),
+        existing_nullable=True,
+    )