From 0fdb7052e9c2cc34a59d8b65201ba4e3393de8a5 Mon Sep 17 00:00:00 2001
From: Erik Montnemery <erik@montnemery.com>
Date: Mon, 3 Oct 2022 11:40:11 +0200
Subject: [PATCH] Add comment in recorder about dropping column (#79523)

Add comment in recorder
---
 homeassistant/components/recorder/migration.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/homeassistant/components/recorder/migration.py b/homeassistant/components/recorder/migration.py
index f82ec7ba1eb2..0ebd761ca53f 100644
--- a/homeassistant/components/recorder/migration.py
+++ b/homeassistant/components/recorder/migration.py
@@ -750,6 +750,9 @@ def _apply_update(  # noqa: C901
     elif new_version == 30:
         # This added a column to the statistics_meta table, removed again before
         # release of HA Core 2022.10.0
+        # SQLite 3.31.0 does not support dropping columns.
+        # Once we require SQLite >= 3.35.5, we should drop the column:
+        # ALTER TABLE statistics_meta DROP COLUMN state_unit_of_measurement
         pass
     else:
         raise ValueError(f"No schema migration defined for version {new_version}")