Index lifecycle capacity checks instead of scanning retained jobs

src/lib/server/backends/schema.ts

@@ -23,6 +23,7 @@ export function migrateNativeInstances(handle: Database.Database): void {
             applied_at TEXT, verified_at TEXT
         );
         CREATE INDEX IF NOT EXISTS native_provisioning_instance ON native_provisioning(instance_id);
+        CREATE INDEX IF NOT EXISTS native_provisioning_operation ON native_provisioning(operation_id, deployment_id);
         CREATE TABLE IF NOT EXISTS provisioning_safety_overrides (
             deployment_id TEXT PRIMARY KEY REFERENCES server_deployments(id) ON DELETE CASCADE,
             actor_id TEXT NOT NULL, actor_name TEXT NOT NULL, confirmed_at TEXT NOT NULL
@@ -35,6 +36,7 @@ export function migrateNativeInstances(handle: Database.Database): void {
         );
         CREATE INDEX IF NOT EXISTS ec_host_migrations_source ON ec_host_migrations(source_host_id);
         CREATE INDEX IF NOT EXISTS ec_host_migrations_target ON ec_host_migrations(target_host_id);
+        CREATE INDEX IF NOT EXISTS ec_host_migrations_operation ON ec_host_migrations(remove_operation_id, deployment_id);
         CREATE TABLE IF NOT EXISTS native_creation_cancellations (
             creation_id TEXT PRIMARY KEY REFERENCES server_deployments(id),
             cleanup_id TEXT NOT NULL UNIQUE REFERENCES server_deployments(id)

src/lib/server/db/index.ts

@@ -393,12 +393,16 @@ export function db(): Database.Database {
             ON server_deployments(server, server_deleted_at);
             CREATE INDEX IF NOT EXISTS idx_server_deployments_state
             ON server_deployments(state, action, server_deleted_at);
+            CREATE INDEX IF NOT EXISTS idx_server_deployments_server_state
+            ON server_deployments(server, server_deleted_at, state, action);
             CREATE INDEX IF NOT EXISTS idx_server_deployments_started_at
             ON server_deployments(started_at);
             CREATE INDEX IF NOT EXISTS idx_server_deployments_submission
             ON server_deployments(server, server_deleted_at, action, submitted_at);
             CREATE INDEX IF NOT EXISTS idx_server_deployments_finished_at
-            ON server_deployments(finished_at) WHERE server_deleted_at IS NULL;`);
+            ON server_deployments(finished_at) WHERE server_deleted_at IS NULL;
+            CREATE INDEX IF NOT EXISTS idx_server_deployments_unsettled
+            ON server_deployments(id) WHERE state NOT IN ('done','warning','cancelled');`);
         installReportRevisions(handle);
     } catch (err) {
         handle.close();

src/lib/server/hosts/schema.ts

@@ -44,6 +44,8 @@ export function ensureHostSchema(handle: Database.Database): void {
         -- causing a history scan for every queued command on Node's main thread.
         CREATE INDEX IF NOT EXISTS ec_host_operations_kind ON ec_host_operations(host_id, kind, created_at);
         CREATE INDEX IF NOT EXISTS ec_host_operations_kind_state ON ec_host_operations(kind, state);
+        CREATE INDEX IF NOT EXISTS ec_host_operations_active ON ec_host_operations(state, id)
+            WHERE state IN ('pending','accepted','running','unknown');
         CREATE TABLE IF NOT EXISTS ec_host_operation_payloads (
             operation_id TEXT PRIMARY KEY REFERENCES ec_host_operations(id) ON DELETE CASCADE,
             payload TEXT NOT NULL

src/lib/server/provisioning/concurrency.ts

@@ -8,18 +8,29 @@ interface Holder { id: string; action: string; host_id: string | null; target_ho
 
 export function lifecycleHolders(): Holder[] {
     ensureHostSchema(db());
+    // Find capacity owners through their active state or outstanding command.
+    // A correlated OR over d used to walk every retained job and fetch its agent
+    // receipt on every admission, even when all that history was completed.
     return db().prepare(`SELECT d.id,d.action,i.host_id,m.target_host_id,
         CASE WHEN m.remove_operation_id IS NOT NULL AND m.removed_at IS NULL THEN 1 ELSE 0 END AS removing
         FROM server_deployments d
         LEFT JOIN native_provisioning n ON n.deployment_id=d.id
         LEFT JOIN native_instances i ON i.id=n.instance_id
         LEFT JOIN ec_host_migrations m ON m.deployment_id=d.id
-        WHERE d.state IN ('running','awaiting-health')
-        OR d.id IN (SELECT value FROM json_each(?))
-        OR EXISTS (SELECT 1 FROM restart_rollout r WHERE r.operation_id=d.id AND r.healthy_at IS NULL)
-        OR (m.remove_operation_id IS NOT NULL AND d.state NOT IN ('done','warning','cancelled'))
-        OR EXISTS (SELECT 1 FROM ec_host_operations o WHERE o.id IN (n.operation_id,m.remove_operation_id)
-            AND o.state IN ('pending','accepted','running','unknown'))`)
+        WHERE d.id IN (
+            SELECT id FROM server_deployments WHERE state IN ('running','awaiting-health')
+            UNION SELECT value FROM json_each(?)
+            UNION SELECT operation_id FROM restart_rollout WHERE healthy_at IS NULL
+            UNION SELECT deployment_id FROM ec_host_migrations
+                WHERE remove_operation_id IS NOT NULL AND deployment_id IN (
+                    SELECT id FROM server_deployments WHERE state NOT IN ('done','warning','cancelled'))
+            UNION SELECT n.deployment_id FROM ec_host_operations o
+                JOIN native_provisioning n ON n.operation_id=o.id
+                WHERE o.state IN ('pending','accepted','running','unknown')
+            UNION SELECT m.deployment_id FROM ec_host_operations o
+                JOIN ec_host_migrations m ON m.remove_operation_id=o.id
+                WHERE o.state IN ('pending','accepted','running','unknown')
+        )`)
         .all(JSON.stringify([...preparingJobs])) as Holder[];
 }