SeaORM: enclosures, downloads and the reaper

Twelve enclosure functions move to SeaORM: recording, the download queue,
marking done or failed, requeueing, and what the reaper may delete. INSERT OR
IGNORE becomes ON CONFLICT DO NOTHING; the reaper's read verdict is true or
false rather than 1 or 0, which Postgres would type as a 32-bit integer and
refuse to read as an i64; `read = 1` and `flagged = 1` test the booleans
themselves. retention::run and its callers (reap, rm, retire_group,
retire_stranded) become async.

The reaper deletes files, so it was checked on a copy of production against the
old SQL on the same file: all 2,195 candidates, identical and in the same order.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/retention.rs

@@ -45,25 +45,25 @@ pub fn aged(candidates: &[Candidate], cutoff: i64) -> Vec<Candidate> {
         .collect()
 }
 
-pub fn run(cfg: &Config, db: &Db, dry_run: bool) -> Result<Report> {
+pub async fn run(cfg: &Config, db: &Db, dry_run: bool) -> Result<Report> {
     let mut report = Report::default();
 
     // Someone may have deleted a file by hand; the row must stop claiming it exists.
-    for (id, path) in db.missing_files()? {
+    for (id, path) in db.missing_files().await? {
         if !dry_run {
-            db.mark_reaped(id)?;
+            db.mark_reaped(id).await?;
         }
         tracing::debug!(path, "file gone, row reaped");
         report.reconciled += 1;
     }
 
-    let candidates = db.reap_candidates()?;
+    let candidates = db.reap_candidates().await?;
 
     if cfg.general.max_age_days > 0 {
         let cutoff = now() - (cfg.general.max_age_days * 86_400) as i64;
         report.aged_out = aged(&candidates, cutoff);
         for c in &report.aged_out {
-            report.bytes_freed += remove(db, c, dry_run)?;
+            report.bytes_freed += remove(db, c, dry_run).await?;
         }
         if !dry_run {
             report.entries_pruned = db.prune_entries(cutoff)?;
@@ -81,14 +81,14 @@ pub fn run(cfg: &Config, db: &Db, dry_run: bool) -> Result<Report> {
         let total: u64 = remaining.iter().map(|c| c.bytes.max(0) as u64).sum();
         report.over_quota = pick(&remaining, total, limit);
         for c in &report.over_quota {
-            report.bytes_freed += remove(db, c, dry_run)?;
+            report.bytes_freed += remove(db, c, dry_run).await?;
         }
     }
 
     Ok(report)
 }
 
-fn remove(db: &Db, c: &Candidate, dry_run: bool) -> Result<u64> {
+async fn remove(db: &Db, c: &Candidate, dry_run: bool) -> Result<u64> {
     if dry_run {
         return Ok(c.bytes.max(0) as u64);
     }
@@ -100,7 +100,7 @@ fn remove(db: &Db, c: &Candidate, dry_run: bool) -> Result<u64> {
         tracing::warn!(path = c.path, error = %e, "could not delete");
         return Ok(0);
     }
-    db.mark_reaped(c.id)?;
+    db.mark_reaped(c.id).await?;
     Ok(size)
 }
 
@@ -176,7 +176,7 @@ mod tests {
         )
         .unwrap();
 
-        let got: Vec<i64> = db.reap_candidates().unwrap().iter().map(|c| c.id).collect();
+        let got: Vec<i64> = db.reap_candidates().await.unwrap().iter().map(|c| c.id).collect();
         assert_eq!(
             got,
             vec![4, 2, 3],