diff --git a/cmd/curio/tasks/tasks.go b/cmd/curio/tasks/tasks.go
index 3b262efa8..71923018d 100644
--- a/cmd/curio/tasks/tasks.go
+++ b/cmd/curio/tasks/tasks.go
@@ -18,6 +18,7 @@ import (
 	curio "github.com/filecoin-project/lotus/curiosrc"
 	"github.com/filecoin-project/lotus/curiosrc/chainsched"
 	"github.com/filecoin-project/lotus/curiosrc/ffi"
+	"github.com/filecoin-project/lotus/curiosrc/gc"
 	"github.com/filecoin-project/lotus/curiosrc/message"
 	"github.com/filecoin-project/lotus/curiosrc/piece"
 	"github.com/filecoin-project/lotus/curiosrc/seal"
@@ -136,6 +137,12 @@ func StartTasks(ctx context.Context, dependencies *deps.Deps) (*harmonytask.Task
 		}
 	}
 
+	if hasAnySealingTask {
+		// Sealing nodes maintain storage index when bored
+		storageEndpointGcTask := gc.NewStorageEndpointGC(si, stor, db)
+		activeTasks = append(activeTasks, storageEndpointGcTask)
+	}
+
 	if needProofParams {
 		for spt := range dependencies.ProofTypes {
 			if err := modules.GetParams(true)(spt); err != nil {
diff --git a/curiosrc/gc/storage_endpoint_gc.go b/curiosrc/gc/storage_endpoint_gc.go
new file mode 100644
index 000000000..8c6e6a0bf
--- /dev/null
+++ b/curiosrc/gc/storage_endpoint_gc.go
@@ -0,0 +1,276 @@
+package gc
+
+import (
+	"context"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	logging "github.com/ipfs/go-log/v2"
+	"github.com/samber/lo"
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
+	"github.com/filecoin-project/lotus/lib/harmony/resources"
+	"github.com/filecoin-project/lotus/lib/result"
+	"github.com/filecoin-project/lotus/storage/paths"
+	"github.com/filecoin-project/lotus/storage/sealer/fsutil"
+	"github.com/filecoin-project/lotus/storage/sealer/storiface"
+)
+
+var log = logging.Logger("curiogc")
+
+const StorageEndpointGCInterval = 2 * time.Minute // todo bump post testing
+const StorageEndpointDeadTime = 15 * time.Minute
+const MaxParallelEndpointChecks = 32
+
+type StorageEndpointGC struct {
+	si     *paths.DBIndex
+	remote *paths.Remote
+	db     *harmonydb.DB
+}
+
+func NewStorageEndpointGC(si *paths.DBIndex, remote *paths.Remote, db *harmonydb.DB) *StorageEndpointGC {
+	return &StorageEndpointGC{
+		si:     si,
+		remote: remote,
+		db:     db,
+	}
+}
+
+func (s *StorageEndpointGC) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bool, err error) {
+	/*
+		1. Get all storage paths + urls (endpoints)
+		2. Ping each url, record results
+		3. Update sector_path_url_liveness with success/failure
+		4.1 If a URL was consistently down for StorageEndpointDeadTime, remove it from the storage_path table
+		4.2 Remove storage paths with no URLs remaining
+		4.2.1 in the same transaction remove sector refs to the dead path
+	*/
+
+	ctx := context.Background()
+
+	var pathRefs []struct {
+		StorageID     storiface.ID `db:"storage_id"`
+		Urls          string       `db:"urls"`
+		LastHeartbeat *time.Time   `db:"last_heartbeat"`
+	}
+
+	err = s.db.Select(ctx, &pathRefs, `SELECT storage_id, urls, last_heartbeat FROM storage_path`)
+	if err != nil {
+		return false, xerrors.Errorf("getting path metadata: %w", err)
+	}
+
+	type pingResult struct {
+		storageID storiface.ID
+		url       string
+
+		res result.Result[fsutil.FsStat]
+	}
+
+	var pingResults []pingResult
+	var resultLk sync.Mutex
+	var resultThrottle = make(chan struct{}, MaxParallelEndpointChecks)
+
+	for _, pathRef := range pathRefs {
+		pathRef := pathRef
+		urls := strings.Split(pathRef.Urls, paths.URLSeparator)
+
+		for _, url := range urls {
+			url := url
+
+			select {
+			case resultThrottle <- struct{}{}:
+			case <-ctx.Done():
+				return false, ctx.Err()
+			}
+
+			go func() {
+				defer func() {
+					<-resultThrottle
+				}()
+
+				st, err := s.remote.StatUrl(ctx, url, pathRef.StorageID)
+
+				res := pingResult{
+					storageID: pathRef.StorageID,
+					url:       url,
+					res:       result.Wrap(st, err),
+				}
+
+				resultLk.Lock()
+				pingResults = append(pingResults, res)
+				resultLk.Unlock()
+			}()
+		}
+	}
+
+	// Wait for all pings to finish
+	for i := 0; i < MaxParallelEndpointChecks; i++ {
+		select {
+		case resultThrottle <- struct{}{}:
+		case <-ctx.Done():
+			return false, ctx.Err()
+		}
+	}
+
+	// Update the liveness table
+
+	/*
+		create table sector_path_url_liveness (
+		    storage_id text,
+		    url text,
+
+		    last_checked timestamp not null,
+		    last_live timestamp,
+		    last_dead timestamp,
+		    last_dead_reason text,
+
+		    primary key (storage_id, url),
+
+		    foreign key (storage_id) references storage_path (storage_id) on delete cascade
+		)
+	*/
+
+	currentTime := time.Now().UTC()
+
+	committed, err := s.db.BeginTransaction(ctx, func(tx *harmonydb.Tx) (bool, error) {
+		for _, pingResult := range pingResults {
+			var lastLive, lastDead, lastDeadReason interface{}
+			if pingResult.res.Error == nil {
+				lastLive = currentTime.UTC()
+				lastDead = nil
+				lastDeadReason = nil
+			} else {
+				lastLive = nil
+				lastDead = currentTime.UTC()
+				lastDeadReason = pingResult.res.Error.Error()
+			}
+
+			_, err := tx.Exec(`
+					INSERT INTO sector_path_url_liveness (storage_id, url, last_checked, last_live, last_dead, last_dead_reason)
+					VALUES ($1, $2, $3, $4, $5, $6)
+					ON CONFLICT (storage_id, url) DO UPDATE
+					SET last_checked = EXCLUDED.last_checked,
+						last_live = COALESCE(EXCLUDED.last_live, sector_path_url_liveness.last_live),
+						last_dead = COALESCE(EXCLUDED.last_dead, sector_path_url_liveness.last_dead),
+						last_dead_reason = COALESCE(EXCLUDED.last_dead_reason, sector_path_url_liveness.last_dead_reason)
+				`, pingResult.storageID, pingResult.url, currentTime, lastLive, lastDead, lastDeadReason)
+			if err != nil {
+				return false, xerrors.Errorf("updating liveness data: %w", err)
+			}
+		}
+
+		return true, nil
+	}, harmonydb.OptionRetry())
+	if err != nil {
+		return false, xerrors.Errorf("sector_path_url_liveness update: %w", err)
+	}
+	if !committed {
+		return false, xerrors.Errorf("sector_path_url_liveness update: transaction didn't commit")
+	}
+
+	///////
+	// Now we do the actual database cleanup
+	if !stillOwned() {
+		return false, xerrors.Errorf("task no longer owned")
+	}
+
+	committed, err = s.db.BeginTransaction(ctx, func(tx *harmonydb.Tx) (bool, error) {
+		// Identify URLs that are consistently down
+		var deadURLs []struct {
+			StorageID storiface.ID
+			URL       string
+		}
+		err = tx.Select(&deadURLs, `
+			SELECT storage_id, url FROM sector_path_url_liveness
+			WHERE last_dead > last_live AND last_dead < $1
+		`, currentTime.Add(-StorageEndpointDeadTime).UTC())
+		if err != nil {
+			return false, xerrors.Errorf("selecting dead URLs: %w", err)
+		}
+
+		log.Debugw("dead urls", "dead_urls", deadURLs)
+
+		// Remove dead URLs from storage_path entries and handle path cleanup
+		for _, du := range deadURLs {
+			// Fetch the current URLs for the storage path
+			var currentPath struct {
+				URLs string
+			}
+			err = tx.Get(&currentPath, "SELECT urls FROM storage_path WHERE storage_id = $1", du.StorageID)
+			if err != nil {
+				return false, xerrors.Errorf("fetching storage paths: %w", err)
+			}
+
+			// Filter out the dead URL using lo.Reject and prepare the updated list
+			urls := strings.Split(currentPath.URLs, paths.URLSeparator)
+			urls = lo.Reject(urls, func(u string, _ int) bool {
+				return u == du.URL
+			})
+
+			log.Debugw("filtered urls", "urls", urls, "dead_url", du.URL, "storage_id", du.StorageID)
+
+			if os.Getenv("CURIO_STORAGE_META_GC_DRYRUN") != "no" { // todo drop this after testing
+				log.Debugw("dryrun: not updating storage path", "storage_id", du.StorageID, "urls", urls, "dead_url", du.URL, "current_urls", currentPath.URLs, "dead_urls", deadURLs)
+				continue
+			}
+
+			if len(urls) == 0 {
+				// If no URLs left, remove the storage path entirely
+				_, err = tx.Exec("DELETE FROM storage_path WHERE storage_id = $1", du.StorageID)
+				if err != nil {
+					return false, xerrors.Errorf("deleting storage path: %w", err)
+				}
+				_, err = tx.Exec("DELETE FROM sector_location WHERE storage_id = $1", du.StorageID)
+				if err != nil {
+					return false, xerrors.Errorf("deleting sector locations: %w", err)
+				}
+			} else {
+				// Update the storage path with the filtered URLs
+				newURLs := strings.Join(urls, paths.URLSeparator)
+				_, err = tx.Exec("UPDATE storage_path SET urls = $1 WHERE storage_id = $2", newURLs, du.StorageID)
+				if err != nil {
+					return false, xerrors.Errorf("updating storage path urls: %w", err)
+				}
+			}
+		}
+
+		return true, nil
+	}, harmonydb.OptionRetry())
+	if err != nil {
+		return false, xerrors.Errorf("removing dead URLs and cleaning storage paths: %w", err)
+	}
+	if !committed {
+		return false, xerrors.Errorf("transaction for removing dead URLs and cleaning paths did not commit")
+	}
+
+	return true, nil
+}
+
+func (s *StorageEndpointGC) CanAccept(ids []harmonytask.TaskID, engine *harmonytask.TaskEngine) (*harmonytask.TaskID, error) {
+	id := ids[0]
+	return &id, nil
+}
+
+func (s *StorageEndpointGC) TypeDetails() harmonytask.TaskTypeDetails {
+	return harmonytask.TaskTypeDetails{
+		Max:  1,
+		Name: "StorageMetaGC",
+		Cost: resources.Resources{
+			Cpu: 1,
+			Ram: 64 << 20,
+			Gpu: 0,
+		},
+		IAmBored: harmonytask.SingletonTaskAdder(StorageEndpointGCInterval, s),
+	}
+}
+
+func (s *StorageEndpointGC) Adder(taskFunc harmonytask.AddTaskFunc) {
+	// lazy endpoint, added when bored
+	return
+}
+
+var _ harmonytask.TaskInterface = &StorageEndpointGC{}
diff --git a/lib/harmony/harmonydb/sql/20240416-harmony_singleton_task.sql b/lib/harmony/harmonydb/sql/20240416-harmony_singleton_task.sql
new file mode 100644
index 000000000..d565cfa47
--- /dev/null
+++ b/lib/harmony/harmonydb/sql/20240416-harmony_singleton_task.sql
@@ -0,0 +1,8 @@
+create table harmony_task_singletons (
+    task_name varchar(255) not null,
+    task_id bigint,
+    last_run_time timestamp,
+
+    primary key (task_name),
+    foreign key (task_id) references harmony_task (id) on delete set null
+);
diff --git a/lib/harmony/harmonydb/sql/20240417-sector_index_gc.sql b/lib/harmony/harmonydb/sql/20240417-sector_index_gc.sql
new file mode 100644
index 000000000..e9771d9f3
--- /dev/null
+++ b/lib/harmony/harmonydb/sql/20240417-sector_index_gc.sql
@@ -0,0 +1,13 @@
+create table sector_path_url_liveness (
+    storage_id text,
+    url text,
+
+    last_checked timestamp not null,
+    last_live timestamp,
+    last_dead timestamp,
+    last_dead_reason text,
+
+    primary key (storage_id, url),
+
+    foreign key (storage_id) references storage_path (storage_id) on delete cascade
+)
diff --git a/lib/harmony/harmonydb/userfuncs.go b/lib/harmony/harmonydb/userfuncs.go
index 759cbd322..5cca8de57 100644
--- a/lib/harmony/harmonydb/userfuncs.go
+++ b/lib/harmony/harmonydb/userfuncs.go
@@ -236,6 +236,10 @@ func (t *Tx) Select(sliceOfStructPtr any, sql rawStringOnly, arguments ...any) e
 	return pgxscan.Select(t.ctx, t.Tx, sliceOfStructPtr, string(sql), arguments...)
 }
 
+func (t *Tx) Get(s any, sql rawStringOnly, arguments ...any) error {
+	return pgxscan.Get(t.ctx, t.Tx, s, string(sql), arguments...)
+}
+
 func IsErrUniqueContraint(err error) bool {
 	var e2 *pgconn.PgError
 	return errors.As(err, &e2) && e2.Code == pgerrcode.UniqueViolation
diff --git a/lib/harmony/harmonytask/singleton_task.go b/lib/harmony/harmonytask/singleton_task.go
new file mode 100644
index 000000000..a7b2d45a2
--- /dev/null
+++ b/lib/harmony/harmonytask/singleton_task.go
@@ -0,0 +1,52 @@
+package harmonytask
+
+import (
+	"errors"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
+	"github.com/filecoin-project/lotus/lib/passcall"
+)
+
+func SingletonTaskAdder(minInterval time.Duration, task TaskInterface) func(AddTaskFunc) error {
+	return passcall.Every(minInterval, func(add AddTaskFunc) error {
+		taskName := task.TypeDetails().Name
+
+		add(func(taskID TaskID, tx *harmonydb.Tx) (shouldCommit bool, err error) {
+			var existingTaskID *int64
+			var lastRunTime time.Time
+
+			// Query to check the existing task entry
+			err = tx.QueryRow(`SELECT task_id, last_run_time FROM harmony_task_singletons WHERE task_name = $1`, taskName).Scan(&existingTaskID, &lastRunTime)
+			if err != nil {
+				if !errors.Is(err, pgx.ErrNoRows) {
+					return false, err // return error if query failed and it's not because of missing row
+				}
+			}
+
+			now := time.Now()
+			// Determine if the task should run based on the absence of a record or outdated last_run_time
+			shouldRun := err == pgx.ErrNoRows || (existingTaskID == nil && lastRunTime.Add(minInterval).Before(now))
+			if !shouldRun {
+				return false, nil
+			}
+
+			// Conditionally insert or update the task entry
+			n, err := tx.Exec(`
+                INSERT INTO harmony_task_singletons (task_name, task_id, last_run_time)
+                VALUES ($1, $2, $3)
+                ON CONFLICT (task_name) DO UPDATE
+                SET task_id = COALESCE(harmony_task_singletons.task_id, $2),
+                    last_run_time = $3
+                WHERE harmony_task_singletons.task_id IS NULL
+            `, taskName, taskID, now)
+			if err != nil {
+				return false, err
+			}
+			return n > 0, nil
+		})
+		return nil
+	})
+}
diff --git a/lib/passcall/every.go b/lib/passcall/every.go
new file mode 100644
index 000000000..f39543063
--- /dev/null
+++ b/lib/passcall/every.go
@@ -0,0 +1,28 @@
+package passcall
+
+import (
+	"sync"
+	"time"
+)
+
+// Every is a helper function that will call the provided callback
+// function at most once every `passEvery` duration. If the function is called
+// more frequently than that, it will return nil and not call the callback.
+func Every[P, R any](passInterval time.Duration, cb func(P) R) func(P) R {
+	var lastCall time.Time
+	var lk sync.Mutex
+
+	return func(param P) R {
+		lk.Lock()
+		defer lk.Unlock()
+
+		if time.Since(lastCall) < passInterval {
+			return *new(R)
+		}
+
+		defer func() {
+			lastCall = time.Now()
+		}()
+		return cb(param)
+	}
+}
diff --git a/storage/paths/remote.go b/storage/paths/remote.go
index abf8622e1..ab2754863 100644
--- a/storage/paths/remote.go
+++ b/storage/paths/remote.go
@@ -416,49 +416,55 @@ func (r *Remote) FsStat(ctx context.Context, id storiface.ID) (fsutil.FsStat, er
 	}
 
 	for _, urlStr := range si.URLs {
-		rl, err := url.Parse(urlStr)
+		out, err := r.StatUrl(ctx, urlStr, id)
 		if err != nil {
-			log.Warnw("failed to parse URL", "url", urlStr, "error", err)
-			continue // Try the next URL
+			log.Warnw("stat url failed", "url", urlStr, "error", err)
+			continue
 		}
 
-		rl.Path = gopath.Join(rl.Path, "stat", string(id))
-
-		req, err := http.NewRequest("GET", rl.String(), nil)
-		if err != nil {
-			log.Warnw("creating request failed", "url", rl.String(), "error", err)
-			continue // Try the next URL
-		}
-		req.Header = r.auth
-		req = req.WithContext(ctx)
-
-		resp, err := http.DefaultClient.Do(req)
-		if err != nil {
-			log.Warnw("request failed", "url", rl.String(), "error", err)
-			continue // Try the next URL
-		}
-
-		if resp.StatusCode == 200 {
-			var out fsutil.FsStat
-			if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
-				_ = resp.Body.Close()
-				log.Warnw("decoding response failed", "url", rl.String(), "error", err)
-				continue // Try the next URL
-			}
-			_ = resp.Body.Close()
-			return out, nil // Successfully decoded, return the result
-		}
-
-		// non-200 status code
-		b, _ := io.ReadAll(resp.Body) // Best-effort read the body for logging
-		log.Warnw("request to endpoint failed", "url", rl.String(), "statusCode", resp.StatusCode, "response", string(b))
-		_ = resp.Body.Close()
-		// Continue to try the next URL, don't return here as we want to try all URLs
+		return out, nil
 	}
 
 	return fsutil.FsStat{}, xerrors.Errorf("all endpoints failed for remote storage %s", id)
 }
 
+func (r *Remote) StatUrl(ctx context.Context, urlStr string, id storiface.ID) (fsutil.FsStat, error) {
+	rl, err := url.Parse(urlStr)
+	if err != nil {
+		return fsutil.FsStat{}, xerrors.Errorf("parsing URL: %w", err)
+	}
+
+	rl.Path = gopath.Join(rl.Path, "stat", string(id))
+
+	req, err := http.NewRequest("GET", rl.String(), nil)
+	if err != nil {
+		return fsutil.FsStat{}, xerrors.Errorf("creating request failed: %w", err)
+	}
+	req.Header = r.auth
+	req = req.WithContext(ctx)
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return fsutil.FsStat{}, xerrors.Errorf("do request: %w", err)
+	}
+
+	if resp.StatusCode == 200 {
+		var out fsutil.FsStat
+		if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
+			_ = resp.Body.Close()
+			return fsutil.FsStat{}, xerrors.Errorf("decoding response failed: %w", err)
+		}
+		_ = resp.Body.Close()
+		return out, nil // Successfully decoded, return the result
+	}
+
+	// non-200 status code
+	b, _ := io.ReadAll(resp.Body) // Best-effort read the body for logging
+	_ = resp.Body.Close()
+
+	return fsutil.FsStat{}, xerrors.Errorf("endpoint failed %s: %d %s", rl.String(), resp.StatusCode, string(b))
+}
+
 func (r *Remote) readRemote(ctx context.Context, url string, offset, size abi.PaddedPieceSize) (io.ReadCloser, error) {
 	if len(r.limit) >= cap(r.limit) {
 		log.Infof("Throttling remote read, %d already running", len(r.limit))