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Added note about using database migration statements

=> 64865605a59e999540b8815069c2dc893e2fd17b

diff --git a/db-migrate.sql b/db-migrate.sql
index cc2fc41..ba8d6b9 100644
--- a/db-migrate.sql
+++ b/db-migrate.sql
@@ -1,3 +1,9 @@
+-- Note: This file contains SQL statements for migrating between versions.
+-- You should _not_ run all of them.  Depending on what you are upgrading
+-- from/to, choose the appropriate statements from this file and run them
+-- manually.  For instance, you could copy/paste them into an interactive
+-- MariaDB prompt.
+
 -- Migration from v1 to v2 --
 ALTER TABLE users ADD COLUMN email_inter INT DEFAULT 30;
 ALTER TABLE users ADD COLUMN email_range VARCHAR(30) DEFAULT '';