fix: add migration to reset team_profile

Closes https://github.com/deltachat/deltachat-desktop/issues/6683.

Unfortunately all profiles that were _intentionally_ created
as "team profiles" will also be reset to be normal profiles.
Since the feature is experimental,
I think it's OK to do this (but surely isn't nice).
At least it's better than having all profiles as team profiles.

People who do actually utilize the feature are either not affected
because we don't run the migration if there are messages
that were created before the buggy Desktop release,
or will have to hack the database,
(as it used to be done originally after
https://github.com/chatmail/core/pull/7694),
or create a new profile.

src/sql/migrations.rs

@@ -2610,6 +2610,42 @@ UPDATE msgs SET state=24 WHERE state=18; -- Change OutPreparing to OutFailed.
         .await?;
     }
 
+    inc_and_check(&mut migration_version, 164)?;
+    if dbversion < migration_version {
+        // https://github.com/deltachat/deltachat-desktop/issues/6683.
+        // Desktop 2.59.0 had a bug where it would always set `team_profile=1`
+        // when creating a new profile.
+        // Unfortunately we can't tell where it was intentional and where not,
+        // so let's just reset the `team_profile` value for all profiles,
+        // except for ones created before the Desktop version was released
+        // (based on whether we have messages older than the release date).
+        // This also affects accounts on non-Desktop clients,
+        // because they could have been _created_ on Desktop
+        // and added as a second device, and `team_profile` is not synced.
+
+        let desktop_2_59_0_release_timestamp: i64 = chrono::NaiveDate::from_ymd_opt(2026, 8, 14)
+            .and_then(|d| d.and_hms_opt(17, 39, 8))
+            .map(|d| d.and_utc().timestamp())
+            .unwrap_or(1786729148);
+
+        sql.execute_migration_transaction(
+            |transaction| {
+                transaction.execute(
+                    "DELETE FROM config WHERE keyname='team_profile'
+                    AND NOT EXISTS (
+                        SELECT *
+                        FROM msgs
+                        WHERE id>9 AND timestamp<? AND timestamp>0
+                    )",
+                    (desktop_2_59_0_release_timestamp,),
+                )?;
+                Ok(())
+            },
+            migration_version,
+        )
+        .await?;
+    }
+
     let new_version = sql
         .get_raw_config_int(VERSION_CFG)
         .await?

src/sql/migrations/migrations_tests.rs

@@ -176,3 +176,21 @@ async fn test_key_contacts_migration_verified() -> Result<()> {
 
     Ok(())
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_team_profile_desktop_2_59_0() -> Result<()> {
+    let t = STOP_MIGRATIONS_AT
+        .scope(163, async move { TestContext::new_alice().await })
+        .await;
+    assert!(t.get_config_bool_opt(Config::TeamProfile).await?.is_none());
+
+    // What Desktop used to do unconditionally.
+    t.set_config_bool(Config::TeamProfile, true).await?;
+    assert!(t.get_config_bool(Config::TeamProfile).await?);
+
+    t.sql.run_migrations(&t).await?;
+
+    assert!(t.get_config_bool_opt(Config::TeamProfile).await?.is_none());
+
+    Ok(())
+}