feat(base)!: no anonymous accounts on the server (ADR 0020, D25)

The server's half of D25: every account has a way in, and the anonymous
accounts left from before go with the daily pruning.

- The module signs nobody in anonymously: `anonymousIdp` and
  `gitHubUpgrade` are gone, and so is linking GitHub at the register.
- A password is set only by someone whose address is theirs (a
  `firstPassword` code) or who signs in with GitHub alone (a fresh
  sign-in and a `signUp` code); an anonymous account is refused
  `wrongCredentials` before any code is used.
- SimpleLogin refuses to link onto a caller without `identified`
  (`wrongCaller`), the member's endpoint too, so nothing turns an
  anonymous account into one with a way in.
- `pruneAnonymousPeople` deletes every anonymous account left, however
  new, never one identified. Learn and Todo schedule it as
  `prune-accounts` and cancel the old `prune-abandoned-anonymous-people`
  entry once.
- Learn: someone without `identified` keeps no files;
  `FILE_LIMIT_ANONYMOUS_MB` is gone. `minimumAppBuild` is 23, as builds
  up to 22 start with an anonymous account.
- Learn's sync tests make their person and session by SQL in the
  development database, as Serverpod stores sessions.
- Docs, store listings and ADRs 0010, 0014, 0016, 0017 and 0019 amended.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_server/lib/src/generated/future_calls.dart

@@ -58,8 +58,7 @@ class FutureCalls extends _is.FutureCallDispatch<_FutureCallRef> {
     String serverId,
   ) {
     var registeredFutureCalls = <String, _is.InvokableFutureCall>{
-      'PruningPruneAnonymousPeopleFutureCall':
-          PruningPruneAnonymousPeopleFutureCall(),
+      'PruningPruneAccountsFutureCall': PruningPruneAccountsFutureCall(),
       'PruningForgetSignUpAttemptsFutureCall':
           PruningForgetSignUpAttemptsFutureCall(),
       'PruningTellMembersOfDeletionsFutureCall':
@@ -194,9 +193,9 @@ class _PruningFutureCallDispatcher {
 
   final _InvokeFutureCall _invokeFutureCall;
 
-  Future<void> pruneAnonymousPeople() {
+  Future<void> pruneAccounts() {
     return _invokeFutureCall(
-      'PruningPruneAnonymousPeopleFutureCall',
+      'PruningPruneAccountsFutureCall',
       null,
     );
   }
@@ -223,18 +222,18 @@ class _PruningFutureCallDispatcher {
   }
 }
 
-/// Prunes one batch and logs how many people went; 30 days after GitHub
-/// sign-in ended (`GITHUB_SIGN_IN_ENDS`), deletes the accounts that had
-/// no other way in and forgets every GitHub ID too, on the register; and
-/// forgets the resets that lapsed (ADR 0017).
-class PruningPruneAnonymousPeopleFutureCall extends _is.FutureCall
+/// Prunes one batch of anonymous accounts and logs how many people went;
+/// 30 days after GitHub sign-in ended (`GITHUB_SIGN_IN_ENDS`), deletes the
+/// accounts that had no other way in and forgets every GitHub ID too, on
+/// the register; and forgets the resets that lapsed (ADR 0017).
+class PruningPruneAccountsFutureCall extends _is.FutureCall
     implements _is.InvokableFutureCall {
   @override
   _ida.Future<void> invoke(
     _is.Session session,
     _is.SerializableModel? object,
   ) async {
-    await _ibrplims.PruningFutureCall().pruneAnonymousPeople(session);
+    await _ibrplims.PruningFutureCall().pruneAccounts(session);
   }
 }
 

apps/todo/halkyon_todo_server/lib/src/pruning.dart

@@ -1,8 +1,11 @@
 import 'package:halkyon_todo_server/src/generated/future_calls.dart';
 import 'package:serverpod/serverpod.dart';
 
-/// The identifier of the daily pruning of abandoned anonymous people.
-const _pruning = 'prune-abandoned-anonymous-people';
+/// The identifier of the daily pruning of accounts.
+const _pruning = 'prune-accounts';
+
+/// The identifier the daily pruning had until ADR 0020, D25.
+const _anonymousPruning = 'prune-abandoned-anonymous-people';
 
 /// The identifier of the hourly forgetting of sign-up attempts.
 const _attemptPruning = 'forget-sign-up-attempts';
@@ -21,20 +24,22 @@ const pruningIdentifiers = [
   _deletedAccounts,
 ];
 
-/// Schedules the pruning (`PruningFutureCall`): abandoned anonymous people
-/// daily, sign-up attempts and expired email codes hourly, and the instance's
+/// Schedules the pruning (`PruningFutureCall`): the anonymous accounts left
+/// from before daily, sign-up attempts and expired email codes hourly, and the instance's
 /// accounts (ADR 0016): the register's deletions its members haven't
 /// confirmed hourly, a member's people the register forgot daily (each does
 /// nothing in the other mode). Scheduling always adds an entry, so the
 /// previous one goes first, and starting the server again leaves one of
-/// each.
+/// each; the one scheduled under the pruning's earlier name, which would
+/// call nothing, goes too.
 Future<void> schedulePruning(Serverpod pod) async {
+  await pod.futureCalls.cancel(_anonymousPruning);
   await pod.futureCalls.cancel(_pruning);
   await pod.futureCalls
       .callRecurring(identifier: _pruning)
       .cron('17 3 * * *')
       .pruning
-      .pruneAnonymousPeople();
+      .pruneAccounts();
 
   await pod.futureCalls.cancel(_attemptPruning);
   await pod.futureCalls

apps/todo/halkyon_todo_server/lib/src/pruning_future_call.dart

@@ -2,25 +2,25 @@ import 'package:clock/clock.dart';
 import 'package:halkyon_base_server/base.dart';
 import 'package:serverpod/serverpod.dart';
 
-/// Deletes the anonymous people nobody can return to, daily, and the IP
-/// addresses of sign-up attempts the rate limit is done with and the email
-/// sign-in codes past their time, hourly: halkyon_base's pruning (ADR 0014),
+/// Deletes the anonymous accounts left from before (ADR 0020, D25), daily,
+/// and the IP addresses of attempts the rate limits are done with and the
+/// email sign-in codes past their time, hourly: halkyon_base's pruning (ADR 0014),
 /// which the server schedules when it starts (`schedulePruning`). Then the
 /// instance's accounts (ADR 0016): as its register, telling the members
 /// again of the accounts gone, hourly; as a member, deleting the people
 /// whose account the register no longer knows, daily.
 class PruningFutureCall extends FutureCall {
-  /// Prunes one batch and logs how many people went; 30 days after GitHub
-  /// sign-in ended (`GITHUB_SIGN_IN_ENDS`), deletes the accounts that had
-  /// no other way in and forgets every GitHub ID too, on the register; and
-  /// forgets the resets that lapsed (ADR 0017).
-  Future<void> pruneAnonymousPeople(Session session) async {
+  /// Prunes one batch of anonymous accounts and logs how many people went;
+  /// 30 days after GitHub sign-in ended (`GITHUB_SIGN_IN_ENDS`), deletes the
+  /// accounts that had no other way in and forgets every GitHub ID too, on
+  /// the register; and forgets the resets that lapsed (ADR 0017).
+  Future<void> pruneAccounts(Session session) async {
     final now = clock.now();
-    final pruned = await pruneAbandonedAnonymousPeople(session, now: now);
+    final pruned = await pruneAnonymousPeople(session);
     final gitHub = await forgetGitHubAccounts(session, now: now);
     final resets = await forgetLapsedResets(session, now: now);
     session.log(
-      'Pruned $pruned abandoned anonymous people, $gitHub GitHub IDs and '
+      'Pruned $pruned anonymous people, $gitHub GitHub IDs and '
       '$resets lapsed resets.',
     );
   }

apps/todo/halkyon_todo_server/test/integration/test_tools/serverpod_test_tools.dart

@@ -166,13 +166,11 @@ class _FutureCalls {
 }
 
 class _PruningFutureCall {
-  Future<void> pruneAnonymousPeople(
-    _ist.TestSessionBuilder sessionBuilder,
-  ) async {
+  Future<void> pruneAccounts(_ist.TestSessionBuilder sessionBuilder) async {
     var _localUniqueSession =
         (sessionBuilder as _ist.InternalTestSessionBuilder).internalBuild();
     try {
-      await _i772x17y.PruningPruneAnonymousPeopleFutureCall().invoke(
+      await _i772x17y.PruningPruneAccountsFutureCall().invoke(
         _localUniqueSession,
         null,
       );

apps/todo/halkyon_todo_server/test/integration/todo_server_test.dart

@@ -54,15 +54,16 @@ void main() {
         );
       });
 
-      test('a device starts without an account through the module, as a '
-          'person of their own', () async {
-        final success = (await call('anonymousIdp', 'login'))! as AuthSuccess;
-
-        final person = await AuthServices.instance.authUsers.get(
-          sessionBuilder.build(),
-          authUserId: success.authUserId,
+      test('makes no account without a way in: the module signs nobody in '
+          'anonymously (ADR 0020, D25)', () {
+        expect(
+          pod.endpoints.getConnectorByName('halkyon_base.anonymousIdp'),
+          isNull,
+        );
+        expect(
+          pod.endpoints.getConnectorByName('halkyon_base.instance'),
+          isNotNull,
         );
-        expect(person.id, success.authUserId);
       });
 
       test("is a member of the instance's register the operator names, and "
@@ -86,8 +87,19 @@ void main() {
       });
 
       test(
-        'the pruning is scheduled once, however often the server starts',
+        'the pruning is scheduled once, however often the server starts, '
+        'and the one under its earlier name goes',
         () async {
+          // INSERT INTO "serverpod_future_call" (…) VALUES (…)
+          await FutureCallEntry.db.insertRow(
+            sessionBuilder.build(),
+            FutureCallEntry(
+              name: 'PruningFutureCall.pruneAnonymousPeople',
+              time: DateTime.utc(2026, 10, 25, 3, 17),
+              serverId: 'default',
+              identifier: 'prune-abandoned-anonymous-people',
+            ),
+          );
           await schedulePruning(pod);
           await schedulePruning(pod);
 
@@ -99,14 +111,22 @@ void main() {
             scheduled.map((entry) => entry.identifier),
             unorderedEquals(pruningIdentifiers),
           );
+          expect(
+            await FutureCallEntry.db.count(
+              sessionBuilder.build(),
+              where: (t) =>
+                  t.identifier.equals('prune-abandoned-anonymous-people'),
+            ),
+            0,
+          );
         },
       );
     },
   );
 }
 
-/// Deletes every rate-limit record, every person (their anonymous accounts
-/// and sessions go with them, `ON DELETE CASCADE`) and every future call.
+/// Deletes every rate-limit record, every person (their sessions go with
+/// them, `ON DELETE CASCADE`) and every future call.
 Future<void> _deleteAll(Session session) async {
   await RateLimitedRequestAttempt.db.deleteWhere(
     session,