diff --git a/src/logging/LogItem.js b/src/logging/LogItem.js
index 69128270..90747964 100644
--- a/src/logging/LogItem.js
+++ b/src/logging/LogItem.js
@@ -43,12 +43,16 @@ export class LogItem {
     /** logs a reference to a different log item, usually obtained from runDetached.
     This is useful if the referenced operation can't be awaited. */
     refDetached(logItem, logLevel = null) {
-        if (!logItem._values.refId) {
-            logItem.set("refId", this._logger._createRefId());
-        }
+        logItem.ensureRefId();
         return this.log({ref: logItem._values.refId}, logLevel);
     }
 
+    ensureRefId() {
+        if (!this._values.refId) {
+            this.set("refId", this._logger._createRefId());
+        }
+    }
+
     /**
      * Creates a new child item and runs it in `callback`.
      */
diff --git a/src/matrix/storage/idb/Store.ts b/src/matrix/storage/idb/Store.ts
index e2da0707..42a41ae6 100644
--- a/src/matrix/storage/idb/Store.ts
+++ b/src/matrix/storage/idb/Store.ts
@@ -18,6 +18,7 @@ import {QueryTarget, IDBQuery} from "./QueryTarget";
 import {IDBRequestAttemptError} from "./error";
 import {reqAsPromise} from "./utils";
 import {Transaction} from "./Transaction";
+import {LogItem} from "../../../logging/LogItem.js";
 
 const LOG_REQUESTS = false;
 
@@ -148,7 +149,7 @@ export class Store<T> extends QueryTarget<T> {
         return new QueryTarget<T>(new QueryTargetWrapper<T>(this._idbStore.index(indexName)));
     }
 
-    put(value: T): void {
+    put(value: T, log?: LogItem): void {
         // If this request fails, the error will bubble up to the transaction and abort it,
         // which is the behaviour we want. Therefore, it is ok to not create a promise for this
         // request and await it.
@@ -159,16 +160,52 @@ export class Store<T> extends QueryTarget<T> {
         // 
         // Note that this can still throw synchronously, like it does for TransactionInactiveError,
         // see https://www.w3.org/TR/IndexedDB-2/#transaction-lifetime-concept
-        this._idbStore.put(value);
+        const request = this._idbStore.put(value);
+        this._prepareErrorLog(request, log, "put", undefined, value);
     }
 
-    add(value: T): void {
+    add(value: T, log?: LogItem): void {
         // ok to not monitor result of request, see comment in `put`.
-        this._idbStore.add(value);
+        const request = this._idbStore.add(value);
+        this._prepareErrorLog(request, log, "add", undefined, value);
     }
 
-    delete(keyOrKeyRange: IDBValidKey | IDBKeyRange): Promise<undefined> {
+    delete(keyOrKeyRange: IDBValidKey | IDBKeyRange, log?: LogItem): void {
         // ok to not monitor result of request, see comment in `put`.
-        return reqAsPromise(this._idbStore.delete(keyOrKeyRange));
+        const request = this._idbStore.delete(keyOrKeyRange);
+        this._prepareErrorLog(request, log, "delete", keyOrKeyRange, undefined);
+    }
+
+    private _prepareErrorLog(request: IDBRequest, log: LogItem | undefined, operationName: string, key: IDBValidKey | IDBKeyRange | undefined, value: T | undefined) {
+        if (log) {
+            log.ensureRefId();
+        }
+        reqAsPromise(request).catch(err => {
+            try {
+                if (!key && value) {
+                    key = this._getKey(value);
+                }
+            } catch {
+                key = "getKey failed";
+            }
+            this._transaction.addWriteError(err, log, operationName, key);
+        });
+    }
+
+    private _getKey(value: T): IDBValidKey {
+        const {keyPath} = this._idbStore;
+        if (Array.isArray(keyPath)) {
+            let field: any = value;
+            for (const part of keyPath) {
+                if (typeof field === "object") {
+                    field = field[part];
+                } else {
+                    break;
+                }
+            }
+            return field as IDBValidKey;
+        } else {
+            return value[keyPath] as IDBValidKey;
+        }        
     }
 }
diff --git a/src/matrix/storage/idb/Transaction.ts b/src/matrix/storage/idb/Transaction.ts
index e9b127ff..291226c5 100644
--- a/src/matrix/storage/idb/Transaction.ts
+++ b/src/matrix/storage/idb/Transaction.ts
@@ -18,6 +18,7 @@ import {StoreNames} from "../common";
 import {txnAsPromise} from "./utils";
 import {StorageError} from "../common";
 import {Store} from "./Store";
+import {Storage} from "./Storage";
 import {SessionStore} from "./stores/SessionStore";
 import {RoomSummaryStore} from "./stores/RoomSummaryStore";
 import {InviteStore} from "./stores/InviteStore";
@@ -35,13 +36,24 @@ import {OutboundGroupSessionStore} from "./stores/OutboundGroupSessionStore";
 import {GroupSessionDecryptionStore} from "./stores/GroupSessionDecryptionStore";
 import {OperationStore} from "./stores/OperationStore";
 import {AccountDataStore} from "./stores/AccountDataStore";
+import {LogItem} from "../../../logging/LogItem.js";
 import {BaseLogger} from "../../../logging/BaseLogger.js";
 
+class WriteErrorInfo {
+    constructor(
+        public readonly error: StorageError,
+        public readonly refItem: LogItem | undefined,
+        public readonly operationName: string,
+        public readonly key: IDBValidKey | IDBKeyRange | undefined,
+    ) {}
+}
+
 export class Transaction {
     private _txn: IDBTransaction;
     private _allowedStoreNames: StoreNames[];
     private _stores: { [storeName in StoreNames]?: any };
     private _storage: Storage;
+    private _writeErrors: WriteErrorInfo[];
 
     constructor(txn: IDBTransaction, allowedStoreNames: StoreNames[], storage: Storage) {
         this._txn = txn;
@@ -154,5 +166,33 @@ export class Transaction {
     abort(): void {
         // TODO: should we wrap the exception in a StorageError?
         this._txn.abort();
+    addWriteError(error: StorageError, refItem: LogItem | undefined, operationName: string, key: IDBValidKey | IDBKeyRange | undefined) {
+        // don't log subsequent `AbortError`s
+        if (error.errcode !== "AbortError" || this._writeErrors.length === 0) {
+            this._writeErrors.push(new WriteErrorInfo(error, refItem, operationName, key));
+        }
+    }
+
+    private _logWriteErrors(parentItem: LogItem | undefined) {
+        const callback = errorGroupItem => {
+            // we don't have context when there is no parentItem, so at least log stores
+            if (!parentItem) {
+                errorGroupItem.set("allowedStoreNames", this._allowedStoreNames);
+            }
+            for (const info of this._writeErrors) {
+                errorGroupItem.wrap({l: info.operationName, id: info.key}, item => {
+                    if (info.refItem) {
+                        item.refDetached(info.refItem);
+                    }
+                    item.catch(info.error);
+                });
+            }
+        };
+        const label = `${this._writeErrors.length} storage write operation(s) failed`;
+        if (parentItem) {
+            parentItem.wrap(label, callback);
+        } else {
+            this.logger.run(label, callback);
+        }
     }
 }