Merge remote-tracking branch 'origin/main' into pr32-merge

# Conflicts:
#	docs/CHANGELOG.md
#	po/de.po
#	po/en_GB.po
#	po/es.po
#	po/fr.po
#	po/it.po
#	po/nl.po
#	po/pdfs.pot
#	po/pl.po
#	po/pt_BR.po

crates/pdfs-core/src/cache.rs

@@ -2309,42 +2309,26 @@ mod tests {
     /// call also needs.
     #[test]
     fn budget_check_is_free_when_under_budget() {
-        use std::time::Instant;
-
         // Cap far above what we store, so every store stays under budget.
         let (c, _d) = cache_capped(1 << 30);
         let payload = vec![0u8; 4096];
-
-        // Cost of a store against a near-empty index...
-        let t = Instant::now();
-        for i in 0..500u64 {
+        for i in 0..8u64 {
             c.store_block(&uid("a"), 1, 1 << 30, blk(1 << 30, i), &payload)
                 .unwrap();
         }
-        let empty = t.elapsed() / 500;
 
-        // ...and against one with a few thousand entries in it.
-        for i in 500..2500u64 {
-            c.store_block(&uid("a"), 1, 1 << 30, blk(1 << 30, i), &payload)
-                .unwrap();
-        }
-        let t = Instant::now();
-        for i in 2500..3000u64 {
-            c.store_block(&uid("a"), 1, 1 << 30, blk(1 << 30, i), &payload)
-                .unwrap();
-        }
-        let full = t.elapsed() / 500;
+        // Plant an index row far over the cap behind the running total's back,
+        // and older than every real block. Any budget check that consults the
+        // index would see the pool over budget, evict, and reseed the total.
+        c.db.cache_touch("planted", KIND_BLOCK, 1 << 40, 0).unwrap();
 
-        println!("B4: store_block under budget — {empty:?} at ~0 entries, {full:?} at 2500");
-        // A ratio, not a wall-clock bound: the claim is that the under-budget
-        // path does not grow with the index, and only a ratio tests that. An
-        // absolute threshold measures the machine's load instead, and this test
-        // runs alongside the rest of the suite.
-        assert!(
-            full < empty * 3,
-            "under-budget store should not scale with the index: \
-             {empty:?} at ~0 entries vs {full:?} at 2500"
-        );
+        c.store_block(&uid("a"), 1, 1 << 30, blk(1 << 30, 8), &payload)
+            .unwrap();
+
+        // Not a timing ratio: that measured the CI runner's load and flaked.
+        assert_eq!(c.block_bytes.load(Ordering::Relaxed), 9 * 4096);
+        let entries = c.db.cache_entries_by_kind(KIND_BLOCK).unwrap();
+        assert_eq!(entries.len(), 10, "under-budget store evicted: {entries:?}");
     }
 
     /// The running totals are a fast path, not a second source of truth: after

crates/pdfs-core/src/control.rs

@@ -446,6 +446,13 @@ pub enum Request {
     /// of registering a duplicate. `uid: None` clears the pin.
     /// Replies with [`Response::Ok`].
     AdoptDevice { uid: Option<String> },
+    /// Move every folder another device backs up into this machine's own
+    /// device, as server-side moves on the main volume. The other device stays
+    /// registered, without those folders. Sync folders here that already track
+    /// one of them follow it to its new share. Nothing is downloaded: the moved
+    /// folders are then offered by [`Request::ListRestorableFolders`].
+    /// Replies with [`Response::Ok`].
+    MigrateDevice { uid: String },
 
     // ---- device folder sync ----------------------------------
     /// Add a local folder to this machine's device, uploading its tree and
@@ -1218,6 +1225,12 @@ pub struct JobItem {
     /// Steps known to need doing, or `0` when unknown (indeterminate progress).
     /// May *grow* mid-job as more work is discovered.
     pub total: u64,
+    /// Housekeeping that changes nothing in the user's files: a mirror folder
+    /// scan that finds nothing to do yet, an index rebuild, a cache check. Front
+    /// ends may show it, but should not report the drive as busy over it. Absent
+    /// from older daemons, which never set it.
+    #[serde(default)]
+    pub background: bool,
 }
 
 /// One in-flight transfer in a [`Response::Transfers`] snapshot.
@@ -3082,6 +3095,9 @@ mod tests {
                 uid: Some("dev-1".into()),
             },
             Request::AdoptDevice { uid: None },
+            Request::MigrateDevice {
+                uid: "dev-2".into(),
+            },
             Request::ListRestorableFolders,
             Request::RestoreSyncFolders {
                 items: vec![RestoreItem {

crates/pdfs-core/src/db/sync.rs

@@ -139,6 +139,17 @@ impl Db {
         Ok(())
     }
 
+    /// Re-point a synced folder at the share that now holds its remote folder,
+    /// after the folder moved to another device without changing its uid.
+    pub fn sync_folder_set_share(&self, id: i64, share_id: &str) -> Result<()> {
+        let conn = self.conn.lock();
+        conn.execute(
+            "UPDATE sync_folder SET remote_share_id = ?2 WHERE id = ?1",
+            params![id, share_id],
+        )?;
+        Ok(())
+    }
+
     /// Queue (or, with `None`, withdraw) a mode the folder should move to once it
     /// is safe to switch.
     pub fn sync_folder_set_pending_mode(&self, id: i64, mode: Option<&str>) -> Result<()> {

crates/pdfs-core/src/db/tests.rs

@@ -4940,6 +4940,28 @@ fn pending_mode_is_queued_until_the_mode_is_reached() {
     assert_eq!(folder.pending_mode, None);
 }
 
+#[test]
+fn moved_sync_folder_points_at_its_new_share() {
+    let db = Db::open_in_memory().unwrap();
+    let id = db
+        .sync_folder_add("/tmp/pdfs-moved-share", "vol~folder", "windows-share")
+        .unwrap();
+    let other = db
+        .sync_folder_add("/tmp/pdfs-unmoved-share", "vol~other", "windows-share")
+        .unwrap();
+
+    db.sync_folder_set_share(id, "linux-share").unwrap();
+
+    let folder = db.sync_folder_get(id).unwrap().unwrap();
+    assert_eq!(folder.remote_share_id, "linux-share");
+    // A move keeps the uid, so nothing but the share changes.
+    assert_eq!(folder.remote_uid, "vol~folder");
+    assert_eq!(
+        db.sync_folder_get(other).unwrap().unwrap().remote_share_id,
+        "windows-share"
+    );
+}
+
 #[test]
 fn mode_commit_clears_only_the_intent_it_satisfies() {
     let db = Db::open_in_memory().unwrap();