diff --git a/lib/ops/aux-user-store-ops.js b/lib/ops/aux-user-store-ops.js
new file mode 100644
--- /dev/null
+++ b/lib/ops/aux-user-store-ops.js
@@ -0,0 +1,123 @@
+// @flow
+
+import type { BaseStoreOpsHandlers } from './base-ops.js';
+import type {
+  AuxUserInfo,
+  AuxUserInfos,
+  AuxUserStore,
+} from '../types/aux-user-types.js';
+
+// client types
+export type ReplaceAuxUserInfoOperation = {
+  +type: 'replace_aux_user_info',
+  +payload: { +id: string, +auxUserInfo: AuxUserInfo },
+};
+
+export type RemoveAuxUserInfosOperation = {
+  +type: 'remove_aux_user_infos',
+  +payload: { +ids: $ReadOnlyArray<string> },
+};
+
+export type RemoveAllAuxUserInfosOperation = {
+  +type: 'remove_all_aux_user_infos',
+};
+
+export type AuxUserStoreOperation =
+  | ReplaceAuxUserInfoOperation
+  | RemoveAuxUserInfosOperation
+  | RemoveAllAuxUserInfosOperation;
+
+// SQLite types
+export type ClientDBAuxUserInfo = {
+  +id: string,
+  +auxUserInfo: string,
+};
+
+export type ClientDBReplaceAuxUserOperation = {
+  +type: 'replace_aux_user_info',
+  +payload: ClientDBAuxUserInfo,
+};
+
+export type ClientDBAuxUserStoreOperation =
+  | ClientDBReplaceAuxUserOperation
+  | RemoveAuxUserInfosOperation
+  | RemoveAllAuxUserInfosOperation;
+
+function convertAuxUserInfoToClientDBAuxUserInfo({
+  id,
+  auxUserInfo,
+}: {
+  +id: string,
+  +auxUserInfo: AuxUserInfo,
+}): ClientDBAuxUserInfo {
+  return {
+    id,
+    auxUserInfo: JSON.stringify(auxUserInfo),
+  };
+}
+
+const auxUserStoreOpsHandlers: BaseStoreOpsHandlers<
+  AuxUserStore,
+  AuxUserStoreOperation,
+  ClientDBAuxUserStoreOperation,
+  AuxUserInfos,
+  ClientDBAuxUserInfo,
+> = {
+  processStoreOperations(
+    auxUserStore: AuxUserStore,
+    ops: $ReadOnlyArray<AuxUserStoreOperation>,
+  ): AuxUserStore {
+    if (ops.length === 0) {
+      return auxUserStore;
+    }
+
+    let processedAuxUserInfos = { ...auxUserStore.auxUserInfos };
+
+    for (const operation of ops) {
+      if (operation.type === 'replace_aux_user_info') {
+        processedAuxUserInfos[operation.payload.id] =
+          operation.payload.auxUserInfo;
+      } else if (operation.type === 'remove_aux_user_infos') {
+        for (const id of operation.payload.ids) {
+          delete processedAuxUserInfos[id];
+        }
+      } else if (operation.type === 'remove_all_aux_user_infos') {
+        processedAuxUserInfos = {};
+      }
+    }
+
+    return { ...auxUserStore, auxUserInfos: processedAuxUserInfos };
+  },
+
+  convertOpsToClientDBOps(
+    ops: $ReadOnlyArray<AuxUserStoreOperation>,
+  ): $ReadOnlyArray<ClientDBAuxUserStoreOperation> {
+    return ops.map(operation => {
+      if (
+        operation.type === 'remove_aux_user_infos' ||
+        operation.type === 'remove_all_aux_user_infos'
+      ) {
+        return operation;
+      }
+
+      return {
+        type: 'replace_aux_user_info',
+        payload: convertAuxUserInfoToClientDBAuxUserInfo(operation.payload),
+      };
+    });
+  },
+
+  translateClientDBData(
+    clientDBAuxUserInfos: $ReadOnlyArray<ClientDBAuxUserInfo>,
+  ): AuxUserInfos {
+    const auxUserInfos: { [id: string]: AuxUserInfo } = {};
+
+    clientDBAuxUserInfos.forEach(dbAuxUserInfo => {
+      auxUserInfos[dbAuxUserInfo.id] = JSON.parse(dbAuxUserInfo.auxUserInfo);
+    });
+
+    return auxUserInfos;
+  },
+};
+
+export { auxUserStoreOpsHandlers, convertAuxUserInfoToClientDBAuxUserInfo };