Automatically place servers using learned resource capacity

src/lib/server/backends/schema.ts

@@ -9,6 +9,7 @@ export function migrateNativeInstances(handle: Database.Database): void {
             port INTEGER NOT NULL, public_address TEXT, public_port INTEGER,
             created_at TEXT NOT NULL, retired_at TEXT
         );
+        CREATE INDEX IF NOT EXISTS native_instance_host ON native_instances(host_id) WHERE retired_at IS NULL;
         CREATE UNIQUE INDEX IF NOT EXISTS native_instance_live_name ON native_instances(server) WHERE retired_at IS NULL;
         CREATE TABLE IF NOT EXISTS native_provisioning (
             deployment_id TEXT PRIMARY KEY REFERENCES server_deployments(id),
@@ -16,6 +17,7 @@ export function migrateNativeInstances(handle: Database.Database): void {
             stage_operation_id TEXT, operation_id TEXT, files_json TEXT,
             applied_at TEXT, verified_at TEXT
         );
+        CREATE INDEX IF NOT EXISTS native_provisioning_instance ON native_provisioning(instance_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)