feat: add a separate watch thumbnail gallery and logical device

pigway_frame_flow/display/thumbnail_gallery.py

@@ -0,0 +1,37 @@
+"""Separate watch gallery metadata; image files retain existing asset access rules."""
+
+import json
+
+from pigway_frame_flow.storage.database import encode
+
+TARGET_ID = "watch"
+
+
+def record(service, asset_id, metadata):
+    service.db.execute(
+        "INSERT OR REPLACE INTO asset_sources VALUES(?,?)",
+        (asset_id, encode({**metadata, "type": "thumbnail", "target_id": TARGET_ID})),
+    )
+
+
+def recover(service):
+    # Earlier automatic thumbnails have authoritative operation receipts. Never
+    # guess that an unrelated image is a thumbnail from its name or dimensions.
+    rows = service.db.all("SELECT result FROM operations WHERE result IS NOT NULL")
+    receipts = [json.loads(row["result"]).get("wrist_thumbnail") for row in rows]
+    receipts += [
+        json.loads(row["payload"])
+        for row in service.db.all(
+            "SELECT payload FROM app_config WHERE key LIKE 'wrist-thumbnail:%'"
+        )
+    ]
+    for receipt in receipts:
+        if not isinstance(receipt, dict) or not receipt.get("asset_id"):
+            continue
+        asset_id = receipt["asset_id"]
+        if service.db.one(
+            "SELECT id FROM assets WHERE id=?", (asset_id,)
+        ) and not service.db.one(
+            "SELECT asset_id FROM asset_sources WHERE asset_id=?", (asset_id,)
+        ):
+            record(service, asset_id, receipt)