Never touch spools of printers this bridge never ran

A fresh instance (empty data volume, no printers configured yet) treated
every spool whose "drucker" field named a printer as stale and moved it to
storage. Now only spools at our slot locations or naming a printer this
bridge runs or has written are corrected; written printer names are kept
in the state (seeded from the applied locations on update).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014GcEk5tkfFSYD6NTF66NkC

app/bridge.py

@@ -948,6 +948,10 @@ class Bridge:
         ours.discard(self.settings.location_storage)
         return ours
 
+    def _our_printers(self) -> set[str]:
+        """Printer names this bridge runs or has written. Spoolman's "drucker" field naming anyone else is not ours."""
+        return set(self.state.data.get("written_printers", [])) | {w.name for w in self.workers.values()}
+
     def _ensure_fields(self) -> bool:
         if self.fields_ok or not self.settings.spoolman_fields:
             return True
@@ -979,14 +983,15 @@ class Bridge:
             if self.clock() - self.last_sync >= SYNC_SECONDS:
                 # Full comparison: the printer wins over manual edits in Spoolman.
                 ours = self._our_locations()
+                our_printers = self._our_printers()
                 for sp in self.spoolman.spools():
                     sid = int(sp["id"])
                     names[sid] = label(sp)
                     actual = self._actual(sp)
                     want = desired.get(sid)
                     if want is None:
-                        if actual["location"] not in ours and actual["printer"] is None:
-                            # a place of yours (e.g. a shelf): not ours to touch
+                        if actual["location"] not in ours and actual["printer"] not in our_printers:
+                            # a place of yours (e.g. a shelf), or a printer this bridge never ran: not ours to touch
                             targets.pop(sid, None)
                             applied.pop(str(sid), None)
                             continue
@@ -1016,6 +1021,9 @@ class Bridge:
                     if t["location"] != storage["location"]:
                         written = set(self.state.data["written_locations"]) | {t["location"]}
                         self.state.data["written_locations"] = sorted(written)
+                    if t.get("printer"):
+                        printers = set(self.state.data.get("written_printers", [])) | {t["printer"]}
+                        self.state.data["written_printers"] = sorted(printers)
         except SpoolmanError as e:
             self.fields_ok = False
             self._spoolman_error(str(e))

app/storage.py

@@ -267,4 +267,6 @@ def migrate_state(data: dict, first_printer: str) -> dict:
         data["version"] = 2
     data.setdefault("applied", {})
     data.setdefault("written_locations", [])
+    if "written_printers" not in data:
+        data["written_printers"] = sorted({a["printer"] for a in data["applied"].values() if a.get("printer")})
     return data