diff --git a/snuba/snuba_migrations/events/0025_add_sourcemapped_subcolumn_exception_frames.py b/snuba/snuba_migrations/events/0025_add_sourcemapped_subcolumn_exception_frames.py
new file mode 100644
index 00000000000..d9a583e14fe
--- /dev/null
+++ b/snuba/snuba_migrations/events/0025_add_sourcemapped_subcolumn_exception_frames.py
@@ -0,0 +1,48 @@
+from typing import Sequence
+
+from snuba.clickhouse.columns import Array, Column, UInt
+from snuba.clusters.storage_sets import StorageSetKey
+from snuba.migrations import migration, operations
+from snuba.migrations.columns import MigrationModifiers as Modifiers
+from snuba.migrations.operations import OperationTarget
+
+
+class Migration(migration.ClickhouseNodeMigration):
+    blocking = False
+
+    storage_set_key = StorageSetKey.EVENTS
+
+    local_table_name = "errors_local"
+    dist_table_name = "errors_dist"
+
+    def forwards_ops(self) -> Sequence[operations.SqlOperation]:
+        return [
+            operations.AddColumn(
+                storage_set=self.storage_set_key,
+                table_name=table_name,
+                column=Column(
+                    "exception_frames.sourcemapped",
+                    Array(UInt(8, Modifiers(nullable=True))),
+                ),
+                after="exception_frames.stack_level",
+                target=target,
+            )
+            for table_name, target in [
+                (self.local_table_name, OperationTarget.LOCAL),
+                (self.dist_table_name, OperationTarget.DISTRIBUTED),
+            ]
+        ]
+
+    def backwards_ops(self) -> Sequence[operations.SqlOperation]:
+        return [
+            operations.DropColumn(
+                storage_set=self.storage_set_key,
+                table_name=table_name,
+                column_name="exception_frames.sourcemapped",
+                target=target,
+            )
+            for table_name, target in [
+                (self.dist_table_name, OperationTarget.DISTRIBUTED),
+                (self.local_table_name, OperationTarget.LOCAL),
+            ]
+        ]