diff --git a/CLAUDE.md b/CLAUDE.md
index a0b12c1..a1b902a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -49,7 +49,7 @@ frontend/             React + TypeScript
     lib/              API client (axios), utils, constants
 
 chart/mgmt-suite/      Helm chart for Kubernetes deployment
-scripts/              Keycloak seeding (seed-keycloak.py — users, groups, memberships, sponsors)
+scripts/              Keycloak seeding (seed-keycloak.py) and project deletion (delete-projects.py)
 ```
 
 ## Running Locally
@@ -77,6 +77,11 @@ cd backend && source .venv/bin/activate && python run.py
 # Frontend
 cd frontend && npm run dev          # Dev server
 cd frontend && npm run build        # Production build (also runs tsc)
+
+# Project deletion
+python scripts/delete-projects.py KEY1 KEY2 --dry-run   # Preview
+python scripts/delete-projects.py KEY1 KEY2              # Delete (DB + Keycloak)
+python scripts/delete-projects.py KEY1 --skip-keycloak   # DB only
 ```
 
 ## Architecture Conventions
@@ -159,6 +164,8 @@ cd frontend && npm run build        # Production build (also runs tsc)
 - **Cert encryption** — Fernet key persists to `.fernet_key` file in dev, env var in production. Changing the key makes existing encrypted data unrecoverable.
 - **Cert passphrase storage** — PKCS12 import passphrases optionally stored encrypted (Fernet) in `passphrase_encrypted` column. Retrieved via separate endpoint for security. PKCS12 export still without passphrase (explicit product decision).
 - **Downtime Tracker** — Logs application outage events with start/end times, cause, resolution, and lessons learned. Enclave field supports multi-select (IL5, IL6) stored as comma-separated string, serialized as array in API. Scope (disabled/limited) and planned (boolean) classify the nature of outages. Work-hours classification computed client-side using `date-fns-tz` against configurable work hours settings.
+- **Project deletion** — No delete API or UI (intentional). Use `scripts/delete-projects.py` for admin-only cleanup. Cascades to: user permissions, feedback, licenses, certs, billing data, KC queue items, KC sync errors, sponsored-user references, and the KC top-level group (which cascades child groups). Supports `--dry-run` and `--skip-keycloak`.
+- **Project key format** — 1-10 characters: first character must be an uppercase letter, followed by uppercase letters or digits. Regex: `^[A-Z][A-Z0-9]{0,9}$`. Validated in routes, import service, and frontend form.
 - **Backend replicas** — scale freely with Postgres.
 
 ## Stubs (Not Yet Implemented)
diff --git a/scripts/delete-projects.py b/scripts/delete-projects.py
new file mode 100755
index 0000000..4e5dbe5
--- /dev/null
+++ b/scripts/delete-projects.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+"""Delete projects by key from the local database and enqueue KC group cleanup.
+
+Usage:
+    python scripts/delete-projects.py SEED1 SEED2 SEED3
+    python scripts/delete-projects.py SEED1 --dry-run
+    python scripts/delete-projects.py SEED1 --skip-keycloak
+"""
+import argparse
+import sys
+import os
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "backend"))
+
+from app import create_app
+from app.extensions import db
+from app.projects.models import Project
+from app.users.models import User, UserPermission
+from app.feedback.models import Feedback
+from app.billing.models import BillingData
+from app.licenses.models import License
+from app.certs.models import Cert
+from app.audit import AuditLog
+from app.kc_queue_models import KcQueueItem
+from app.settings.models import KcSyncError
+
+
+def delete_project(key, dry_run=False, skip_kc=False):
+    project = Project.query.filter_by(key=key).first()
+    if not project:
+        print(f"  [{key}] NOT FOUND — skipping")
+        return False
+
+    print(f"  [{key}] \"{project.name}\" (id={project.id})")
+
+    # Gather counts for summary
+    perm_count = UserPermission.query.filter_by(project_key=key).count()
+    feedback_count = Feedback.query.filter_by(project_key=key).count()
+    license_count = project.licenses.count()
+    cert_count = project.certs.count()
+    billing = BillingData.query.filter_by(project_id=project.id).first()
+    sponsor_count = User.query.filter_by(sponsor_project_key=key).count()
+    queue_count = KcQueueItem.query.filter_by(project_key=key).count()
+    sync_err_count = KcSyncError.query.filter_by(project_key=key).count()
+
+    print(f"    permissions: {perm_count}, feedback: {feedback_count}, "
+          f"licenses: {license_count}, certs: {cert_count}")
+    print(f"    billing: {'yes' if billing else 'no'}, "
+          f"sponsored users: {sponsor_count}, "
+          f"kc queue items: {queue_count}, sync errors: {sync_err_count}")
+
+    if dry_run:
+        print(f"    DRY RUN — no changes made")
+        return True
+
+    UserPermission.query.filter_by(project_key=key).delete()
+    Feedback.query.filter_by(project_key=key).delete()
+    License.query.filter(License.project_id == project.id).delete()
+    Cert.query.filter(Cert.project_id == project.id).delete()
+    if billing:
+        db.session.delete(billing)
+
+    User.query.filter_by(sponsor_project_key=key).update(
+        {"sponsor_project_key": None, "unsponsored_since": None}
+    )
+
+    KcQueueItem.query.filter_by(project_key=key).delete()
+    KcSyncError.query.filter_by(project_key=key).delete()
+
+    db.session.delete(project)
+    db.session.commit()
+    print(f"    DELETED from database")
+
+    if not skip_kc:
+        try:
+            from app.keycloak import KeycloakAdmin
+            kc = KeycloakAdmin()
+            group_id = kc.find_group_by_name(key)
+            if group_id:
+                kc.delete_group(group_id)
+                print(f"    DELETED KC group \"{key}\" ({group_id})")
+            else:
+                print(f"    KC group \"{key}\" not found — nothing to delete")
+        except Exception as e:
+            print(f"    WARNING: KC group cleanup failed: {e}")
+            print(f"    You may need to manually remove the \"{key}\" group from Keycloak")
+
+    return True
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Delete projects by key")
+    parser.add_argument("keys", nargs="+", help="Project keys to delete")
+    parser.add_argument("--dry-run", action="store_true",
+                        help="Show what would be deleted without making changes")
+    parser.add_argument("--skip-keycloak", action="store_true",
+                        help="Skip Keycloak group deletion (DB only)")
+    args = parser.parse_args()
+
+    app = create_app()
+    with app.app_context():
+        print(f"{'DRY RUN — ' if args.dry_run else ''}Deleting {len(args.keys)} project(s):\n")
+
+        deleted = 0
+        for key in args.keys:
+            key = key.strip().upper()
+            if delete_project(key, dry_run=args.dry_run, skip_kc=args.skip_keycloak):
+                deleted += 1
+            print()
+
+        label = "would be deleted" if args.dry_run else "deleted"
+        print(f"Done. {deleted}/{len(args.keys)} project(s) {label}.")
+
+
+if __name__ == "__main__":
+    main()