refactor(scribe): retire calendar/events + person/place/list entities (backend)

Narrow Scribe to a Claude-Code work system-of-record (milestone #194,
decision note #1759). Wholesale removal per rule #22 — backend + schema half.

Calendar/events + CalDAV: delete models/event, services/{events,caldav,
caldav_sync}, routes/events, mcp/tools/events; strip event branches from
backup (bump v3->v4), dashboard (upcoming_events), trash, recent, and the
mcp server read-only allowlist + instructions.

Typed entities (person/place/list): delete mcp/tools/entities; drop the
notes.metadata (entity_meta) column from model/service/routes and the
knowledge browse service. note_type STAYS — it also marks 'process' notes.

Scheduler: event_scheduler -> recurrence_scheduler, keeping only the
recurring-task spawn job (drops event reminders + CalDAV sync).

Schema: migration 0069 drops the events table + notes.metadata column +
orphan caldav settings rows (faithful downgrade recreates them).

KEEP: recurrence.py (task recurrence), notifications task reminders, graph
view, and every work surface. Frontend + plugin/docs true-up follow next.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BPtbSzA4JLMAKgFZ8VTg7Q

src/scribe/services/backup.py

@@ -4,7 +4,6 @@ from datetime import date, datetime, timezone
 from sqlalchemy import or_, select
 
 from scribe.models import async_session
-from scribe.models.event import Event
 from scribe.models.milestone import Milestone
 from scribe.models.note import Note
 from scribe.models.note_draft import NoteDraft
@@ -25,9 +24,10 @@ from scribe.models.user import User
 logger = logging.getLogger(__name__)
 
 # Backup format version. v3 (2026-06) added rulebooks/topics/rules + their
-# project subscription/suppression join tables, and events — all silently
-# dropped by v2. Bump when the serialized schema changes.
-BACKUP_VERSION = 3
+# project subscription/suppression join tables. v4 (2026-07) dropped events
+# when the calendar surface was retired — old v3 events are skipped on restore.
+# Bump when the serialized schema changes.
+BACKUP_VERSION = 4
 
 # Tables intentionally NOT in the backup, surfaced in the payload so the gap is
 # explicit rather than silent. ACL (groups/shares) is a coherent follow-up;
@@ -80,7 +80,6 @@ async def export_full_backup() -> dict:
         rulebooks = (await session.execute(select(Rulebook))).scalars().all()
         topics = (await session.execute(select(RulebookTopic))).scalars().all()
         rules = (await session.execute(select(Rule))).scalars().all()
-        events = (await session.execute(select(Event))).scalars().all()
         subscriptions = (await session.execute(
             select(project_rulebook_subscriptions)
         )).all()
@@ -245,27 +244,6 @@ async def export_full_backup() -> dict:
         "rulebook_subscriptions": _subscription_rows(subscriptions),
         "rule_suppressions": _rule_suppression_rows(rule_suppressions),
         "topic_suppressions": _topic_suppression_rows(topic_suppressions),
-        "events": [
-            {
-                "id": e.id,
-                "user_id": e.user_id,
-                "project_id": e.project_id,
-                "uid": e.uid,
-                "caldav_uid": e.caldav_uid,
-                "title": e.title,
-                "start_dt": e.start_dt.isoformat() if e.start_dt else None,
-                "duration_minutes": e.duration_minutes,
-                "all_day": e.all_day,
-                "description": e.description,
-                "location": e.location,
-                "color": e.color,
-                "recurrence": e.recurrence,
-                "reminder_minutes": e.reminder_minutes,
-                "created_at": e.created_at.isoformat(),
-                "updated_at": e.updated_at.isoformat(),
-            }
-            for e in events
-        ],
     }
 
 
@@ -314,9 +292,6 @@ async def export_user_backup(user_id: int) -> dict:
         rules = (await session.execute(
             select(Rule).where(or_(*rule_filters))
         )).scalars().all() if rule_filters else []
-        events = (await session.execute(
-            select(Event).where(Event.user_id == user_id)
-        )).scalars().all()
         if project_ids:
             subscriptions = (await session.execute(
                 select(project_rulebook_subscriptions).where(
@@ -480,27 +455,6 @@ async def export_user_backup(user_id: int) -> dict:
         "rulebook_subscriptions": _subscription_rows(subscriptions),
         "rule_suppressions": _rule_suppression_rows(rule_suppressions),
         "topic_suppressions": _topic_suppression_rows(topic_suppressions),
-        "events": [
-            {
-                "id": e.id,
-                "user_id": e.user_id,
-                "project_id": e.project_id,
-                "uid": e.uid,
-                "caldav_uid": e.caldav_uid,
-                "title": e.title,
-                "start_dt": e.start_dt.isoformat() if e.start_dt else None,
-                "duration_minutes": e.duration_minutes,
-                "all_day": e.all_day,
-                "description": e.description,
-                "location": e.location,
-                "color": e.color,
-                "recurrence": e.recurrence,
-                "reminder_minutes": e.reminder_minutes,
-                "created_at": e.created_at.isoformat(),
-                "updated_at": e.updated_at.isoformat(),
-            }
-            for e in events
-        ],
     }
 
 
@@ -591,17 +545,17 @@ async def _restore_v1(data: dict) -> dict:
 async def _restore_v2(data: dict) -> dict:
     """Restore v2/v3 backup with full FK re-mapping.
 
-    Conversations + push subscriptions in pre-pivot backups are silently
-    skipped — those subsystems were removed in the MCP-first pivot. v3-only
-    sections (rulebooks/topics/rules/join-tables/events) are guarded by
-    data.get so a v2 payload restores without them.
+    Conversations, push subscriptions, and (as of v4) events in older backups
+    are silently skipped — those subsystems were removed. v3+ sections
+    (rulebooks/topics/rules/join-tables) are guarded by data.get so a v2
+    payload restores without them.
     """
     stats: dict[str, int] = {
         "users": 0, "projects": 0, "milestones": 0, "notes": 0,
         "task_logs": 0, "note_drafts": 0, "note_versions": 0,
         "settings": 0, "rulebooks": 0, "rulebook_topics": 0, "rules": 0,
         "rulebook_subscriptions": 0, "rule_suppressions": 0,
-        "topic_suppressions": 0, "events": 0,
+        "topic_suppressions": 0,
     }
 
     async with async_session() as session:
@@ -860,31 +814,6 @@ async def _restore_v2(data: dict) -> dict:
             ))
             stats["topic_suppressions"] += 1
 
-        # 15. Events (v3)
-        for e_data in data.get("events", []):
-            mapped_uid = user_id_map.get(e_data.get("user_id", 0))
-            if mapped_uid is None:
-                continue
-            ev = Event(
-                user_id=mapped_uid,
-                project_id=project_id_map.get(e_data["project_id"]) if e_data.get("project_id") else None,
-                uid=e_data.get("uid", ""),
-                caldav_uid=e_data.get("caldav_uid", ""),
-                title=e_data.get("title", ""),
-                start_dt=_dt(e_data.get("start_dt")),
-                duration_minutes=e_data.get("duration_minutes"),
-                all_day=e_data.get("all_day", False),
-                description=e_data.get("description", ""),
-                location=e_data.get("location", ""),
-                color=e_data.get("color", ""),
-                recurrence=e_data.get("recurrence"),
-                reminder_minutes=e_data.get("reminder_minutes"),
-                created_at=_dt(e_data.get("created_at")),
-                updated_at=_dt(e_data.get("updated_at")),
-            )
-            session.add(ev)
-            stats["events"] += 1
-
         await session.commit()
 
     logger.info("Restored v2/v3 backup: %s", stats)