Make proxmox_storage a global setting instead of a per-job snapshot

Backup jobs stored their own proxmox_storage column, copied from
settings at creation time and never resynced. process_backup preferred
that frozen job value, so changing Settings > Proxmox storage had no
effect on existing jobs. Drop the per-job column and always use the
current global setting when starting a backup.

Also copies AGENTS.md to CLAUDE.md.

backend/app/backup_service.py

@@ -245,7 +245,7 @@ async def process_backup(backup_id: str) -> None:
                 commands.start_proxmox_backup,
                 node=backup["node"],
                 vmid=int(backup["guest_vmid"]),
-                storage=(job or {}).get("proxmox_storage") or settings["proxmox_storage"],
+                storage=settings["proxmox_storage"],
                 mode=(job or {}).get("backup_mode") or settings["default_backup_mode"],
                 compression=(job or {}).get("compression") or settings["default_compression"],
             )

backend/app/jobs.py

@@ -51,10 +51,10 @@ def create_job(payload: dict) -> dict:
             """
             INSERT INTO backup_jobs(
                 guest_vmid, guest_name, guest_type, node, enabled, cron_schedule,
-                proxmox_storage, backup_mode, compression, retention_type, retention_value,
+                backup_mode, compression, retention_type, retention_value,
                 next_run_at, created_at, updated_at
             )
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
             (
                 payload["guest_vmid"],
@@ -63,7 +63,6 @@ def create_job(payload: dict) -> dict:
                 payload["node"],
                 int(payload.get("enabled", True)),
                 payload["cron_schedule"],
-                payload["proxmox_storage"],
                 payload["backup_mode"],
                 payload["compression"],
                 payload["retention_type"],
@@ -88,7 +87,7 @@ def update_job(job_id: int, payload: dict) -> dict:
             """
             UPDATE backup_jobs SET
                 guest_vmid = ?, guest_name = ?, guest_type = ?, node = ?, enabled = ?,
-                cron_schedule = ?, proxmox_storage = ?, backup_mode = ?, compression = ?,
+                cron_schedule = ?, backup_mode = ?, compression = ?,
                 retention_type = ?, retention_value = ?, next_run_at = ?, updated_at = ?
             WHERE id = ?
             """,
@@ -99,7 +98,6 @@ def update_job(job_id: int, payload: dict) -> dict:
                 merged["node"],
                 int(merged["enabled"]),
                 merged["cron_schedule"],
-                merged["proxmox_storage"],
                 merged["backup_mode"],
                 merged["compression"],
                 merged["retention_type"],

backend/app/main.py

@@ -50,7 +50,6 @@ class JobPayload(BaseModel):
     node: str
     enabled: bool = True
     cron_schedule: str
-    proxmox_storage: str
     backup_mode: str
     compression: str
     retention_type: str
@@ -64,7 +63,6 @@ class PartialJobPayload(BaseModel):
     node: str | None = None
     enabled: bool | None = None
     cron_schedule: str | None = None
-    proxmox_storage: str | None = None
     backup_mode: str | None = None
     compression: str | None = None
     retention_type: str | None = None

backend/app/migrations.py

@@ -179,3 +179,10 @@ def run_migrations() -> None:
                 "INSERT INTO schema_migrations(version, applied_at) VALUES (?, ?)",
                 (4, now),
             )
+        if 5 not in applied:
+            now = utc_now()
+            conn.execute("ALTER TABLE backup_jobs DROP COLUMN proxmox_storage")
+            conn.execute(
+                "INSERT INTO schema_migrations(version, applied_at) VALUES (?, ?)",
+                (5, now),
+            )

backend/tests/test_backup_service.py

@@ -36,7 +36,6 @@ def _job():
             "node": "pve",
             "enabled": True,
             "cron_schedule": "0 2 * * *",
-            "proxmox_storage": "backup-store",
             "backup_mode": "snapshot",
             "compression": "zstd",
             "retention_type": "latest",