diff --git a/client/src/components/bill-detail-edit/bill-detail-edit-component.jsx b/client/src/components/bill-detail-edit/bill-detail-edit-component.jsx
index d04f86cd2..2704986b5 100644
--- a/client/src/components/bill-detail-edit/bill-detail-edit-component.jsx
+++ b/client/src/components/bill-detail-edit/bill-detail-edit-component.jsx
@@ -13,6 +13,7 @@ import { insertAuditTrail } from "../../redux/application/application.actions";
 import { selectBodyshop } from "../../redux/user/user.selectors";
 import AuditTrailMapping from "../../utils/AuditTrailMappings";
 import dayjs from "../../utils/day";
+import { buildBillUpdateAuditDetails } from "../../utils/auditTrailDetails";
 import AlertComponent from "../alert/alert.component";
 import BillFormContainer from "../bill-form/bill-form.container";
 import BillMarkExportedButton from "../bill-mark-exported-button/bill-mark-exported-button.component";
@@ -134,10 +135,16 @@ export function BillDetailEditcontainer({ insertAuditTrail, bodyshop }) {
 
     await Promise.all(updates);
 
+    const details = buildBillUpdateAuditDetails({
+      originalBill: data?.bills_by_pk,
+      bill,
+      billlines
+    });
+
     insertAuditTrail({
-      jobid: bill.jobid,
+      jobid: bill.jobid ?? data?.bills_by_pk?.jobid,
       billid: search.billid,
-      operation: AuditTrailMapping.billupdated(bill.invoice_number),
+      operation: AuditTrailMapping.billupdated(bill.invoice_number, details),
       type: "billupdated"
     });
 
diff --git a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
index 14e1d0a85..5140e43dd 100644
--- a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
+++ b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
@@ -14,16 +14,20 @@ import CriticalPartsScan from "../../utils/criticalPartsScan";
 import UndefinedToNull from "../../utils/undefinedtonull";
 import JobLinesUpdsertModal from "./job-lines-upsert-modal.component";
 import { useNotification } from "../../contexts/Notifications/notificationContext.jsx";
+import AuditTrailMapping from "../../utils/AuditTrailMappings.js";
+import { insertAuditTrail } from "../../redux/application/application.actions.js";
+import { buildJobLineInsertAuditDetails, buildJobLineUpdateAuditDetails } from "../../utils/auditTrailDetails.js";
 
 const mapStateToProps = createStructuredSelector({
   jobLineEditModal: selectJobLineEditModal,
   bodyshop: selectBodyshop
 });
 const mapDispatchToProps = (dispatch) => ({
-  toggleModalVisible: () => dispatch(toggleModalVisible("jobLineEdit"))
+  toggleModalVisible: () => dispatch(toggleModalVisible("jobLineEdit")),
+  insertAuditTrail: ({ jobid, operation, type }) => dispatch(insertAuditTrail({ jobid, operation, type }))
 });
 
-function JobLinesUpsertModalContainer({ jobLineEditModal, toggleModalVisible, bodyshop }) {
+function JobLinesUpsertModalContainer({ jobLineEditModal, toggleModalVisible, bodyshop, insertAuditTrail }) {
   const {
     treatments: { CriticalPartsScanning }
   } = useTreatmentsWithConfig({
@@ -74,6 +78,11 @@ function JobLinesUpsertModalContainer({ jobLineEditModal, toggleModalVisible, bo
         notification.success({
           title: t("joblines.successes.created")
         });
+        insertAuditTrail({
+          jobid: jobLineEditModal.context.jobid,
+          operation: AuditTrailMapping.jobmanuallineinsert(buildJobLineInsertAuditDetails(values)),
+          type: "jobmanuallineinsert"
+        });
       } else {
         notification.error({
           title: t("joblines.errors.creating", {
@@ -103,6 +112,17 @@ function JobLinesUpsertModalContainer({ jobLineEditModal, toggleModalVisible, bo
         notification.success({
           title: t("joblines.successes.updated")
         });
+        insertAuditTrail({
+          jobid: jobLineEditModal.context.jobid,
+          operation: AuditTrailMapping.joblineupdate(
+            values.line_desc || jobLineEditModal.context.line_desc || "manual line",
+            buildJobLineUpdateAuditDetails({
+              originalLine: jobLineEditModal.context,
+              values
+            })
+          ),
+          type: "joblineupdate"
+        });
       } else {
         notification.success({
           title: t("joblines.errors.updating", {
diff --git a/client/src/components/time-ticket-modal/time-ticket-modal.container.jsx b/client/src/components/time-ticket-modal/time-ticket-modal.container.jsx
index ba3de7760..4f664a11c 100644
--- a/client/src/components/time-ticket-modal/time-ticket-modal.container.jsx
+++ b/client/src/components/time-ticket-modal/time-ticket-modal.container.jsx
@@ -2,7 +2,7 @@ import { PageHeader } from "@ant-design/pro-layout";
 import { useMutation, useQuery } from "@apollo/client/react";
 import { useTreatmentsWithConfig } from "@splitsoftware/splitio-react";
 import { Button, Form, Modal, Space } from "antd";
-import { useEffect, useState } from "react";
+import { useEffect, useState, useRef } from "react";
 import { useTranslation } from "react-i18next";
 import { connect } from "react-redux";
 import { createStructuredSelector } from "reselect";
@@ -15,21 +15,27 @@ import { selectBodyshop } from "../../redux/user/user.selectors";
 import dayjs from "../../utils/day";
 import TimeTicketsCommitToggleComponent from "../time-tickets-commit-toggle/time-tickets-commit-toggle.component";
 import TimeTicketModalComponent from "./time-ticket-modal.component";
+import { insertAuditTrail } from "../../redux/application/application.actions.js";
+import AuditTrailMapping from "../../utils/AuditTrailMappings";
+import { buildTimeTicketAuditSummary } from "../../utils/auditTrailDetails.js";
 
 const mapStateToProps = createStructuredSelector({
   timeTicketModal: selectTimeTicket,
   bodyshop: selectBodyshop
 });
 const mapDispatchToProps = (dispatch) => ({
-  toggleModalVisible: () => dispatch(toggleModalVisible("timeTicket"))
+  toggleModalVisible: () => dispatch(toggleModalVisible("timeTicket")),
+  insertAuditTrail: ({ jobid, operation, type }) => dispatch(insertAuditTrail({ jobid, operation, type }))
 });
 
-export function TimeTicketModalContainer({ timeTicketModal, toggleModalVisible, bodyshop }) {
+export function TimeTicketModalContainer({ timeTicketModal, toggleModalVisible, bodyshop, insertAuditTrail }) {
   const [form] = Form.useForm();
   const [loading, setLoading] = useState(false);
   const { t } = useTranslation();
   const [enterAgain, setEnterAgain] = useState(false);
 
+  const lastSubmittedRef = useRef(null);
+
   const [lineTicketRefreshKey, setLineTicketRefreshKey] = useState(0);
 
   const [insertTicket] = useMutation(INSERT_NEW_TIME_TICKET);
@@ -48,47 +54,77 @@ export function TimeTicketModalContainer({ timeTicketModal, toggleModalVisible,
     fetchPolicy: "network-only",
     nextFetchPolicy: "network-only"
   });
+  const employees = EmployeeAutoCompleteData?.employees ?? [];
 
   const handleFinish = (values) => {
+    lastSubmittedRef.current = values;
     setLoading(true);
-    const emps = EmployeeAutoCompleteData?.employees.filter((e) => e.id === values.employeeid);
-    if (timeTicketModal.context.id) {
-      updateTicket({
-        variables: {
-          timeticketId: timeTicketModal.context.id,
-          timeticket: {
-            ...values,
-            rate: emps.length === 1 ? emps[0].rates.filter((r) => r.cost_center === values.cost_center)[0]?.rate : null
-          }
-        }
-      })
-        .then(handleMutationSuccess)
-        .catch(handleMutationError);
-    } else {
-      //Get selected employee rate.
-      insertTicket({
-        variables: {
-          timeTicketInput: [
-            {
+    const isEdit = Boolean(timeTicketModal.context.id);
+    const emps = employees.filter((employee) => employee.id === values.employeeid);
+    const mutation = isEdit
+      ? updateTicket({
+          variables: {
+            timeticketId: timeTicketModal.context.id,
+            timeticket: {
               ...values,
               rate:
-                emps.length === 1 ? emps[0].rates.filter((r) => r.cost_center === values.cost_center)[0].rate : null,
-              bodyshopid: bodyshop.id,
-              created_by: timeTicketModal.context.created_by
+                emps.length === 1 ? emps[0].rates.filter((r) => r.cost_center === values.cost_center)[0]?.rate : null
             }
-          ]
-        }
-      })
-        .then(handleMutationSuccess)
-        .catch(handleMutationError);
-    }
+          }
+        })
+      : insertTicket({
+          variables: {
+            timeTicketInput: [
+              {
+                ...values,
+                rate:
+                  emps.length === 1 ? emps[0].rates.filter((r) => r.cost_center === values.cost_center)[0].rate : null,
+                bodyshopid: bodyshop.id,
+                created_by: timeTicketModal.context.created_by
+              }
+            ]
+          }
+        });
+
+    mutation.then((result) => handleMutationSuccess(result, isEdit)).catch(handleMutationError);
   };
 
-  const handleMutationSuccess = () => {
+  const handleMutationSuccess = (result, isEdit) => {
     notification.success({
       title: t("timetickets.successes.created")
     });
 
+    const savedTicket =
+      result?.data?.update_timetickets?.returning?.[0] ?? result?.data?.insert_timetickets?.returning?.[0] ?? {};
+    const originalTicket = timeTicketModal.context?.timeticket ?? {};
+    const submittedValues = {
+      ...(lastSubmittedRef.current ?? {}),
+      date: lastSubmittedRef.current?.date ?? savedTicket.date ?? originalTicket.date ?? null,
+      employeeid: lastSubmittedRef.current?.employeeid ?? savedTicket.employeeid ?? originalTicket.employeeid ?? null,
+      jobid:
+        lastSubmittedRef.current?.jobid ??
+        savedTicket.jobid ??
+        timeTicketModal.context.jobId ??
+        originalTicket.job?.id ??
+        originalTicket.jobid ??
+        null
+    };
+    const auditSummary = buildTimeTicketAuditSummary({
+      originalTicket,
+      submittedValues,
+      employees
+    });
+
+    if (auditSummary.jobid) {
+      insertAuditTrail({
+        jobid: auditSummary.jobid,
+        operation: isEdit
+          ? AuditTrailMapping.timeticketupdated(auditSummary.employeeName, auditSummary.date, auditSummary.details)
+          : AuditTrailMapping.timeticketcreated(auditSummary.employeeName, auditSummary.date, auditSummary.details),
+        type: isEdit ? "timeticketupdated" : "timeticketcreated"
+      });
+    }
+
     // Refresh parent screens (Job Labor tab, etc.)
     if (timeTicketModal.actions.refetch) timeTicketModal.actions.refetch();
 
diff --git a/client/src/pages/jobs-create/jobs-create.container.jsx b/client/src/pages/jobs-create/jobs-create.container.jsx
index 5b5627ef1..b3cc808b2 100644
--- a/client/src/pages/jobs-create/jobs-create.container.jsx
+++ b/client/src/pages/jobs-create/jobs-create.container.jsx
@@ -8,13 +8,14 @@ import { createStructuredSelector } from "reselect";
 import RbacWrapper from "../../components/rbac-wrapper/rbac-wrapper.component";
 import { INSERT_NEW_JOB } from "../../graphql/jobs.queries";
 import { QUERY_OWNER_FOR_JOB_CREATION } from "../../graphql/owners.queries";
-import { setBreadcrumbs, setSelectedHeader } from "../../redux/application/application.actions";
+import { insertAuditTrail, setBreadcrumbs, setSelectedHeader } from "../../redux/application/application.actions";
 import { selectBodyshop, selectCurrentUser } from "../../redux/user/user.selectors";
 import InstanceRenderManager from "../../utils/instanceRenderMgr";
 import JobsCreateComponent from "./jobs-create.component";
 import JobCreateContext from "./jobs-create.context";
 import { useNotification } from "../../contexts/Notifications/notificationContext.jsx";
 import { logImEXEvent } from "../../firebase/firebase.utils";
+import AuditTrailMapping from "../../utils/AuditTrailMappings.js";
 
 const mapStateToProps = createStructuredSelector({
   bodyshop: selectBodyshop,
@@ -22,10 +23,11 @@ const mapStateToProps = createStructuredSelector({
 });
 const mapDispatchToProps = (dispatch) => ({
   setBreadcrumbs: (breadcrumbs) => dispatch(setBreadcrumbs(breadcrumbs)),
-  setSelectedHeader: (key) => dispatch(setSelectedHeader(key))
+  setSelectedHeader: (key) => dispatch(setSelectedHeader(key)),
+  insertAuditTrail: ({ jobid, operation, type }) => dispatch(insertAuditTrail({ jobid, operation, type }))
 });
 
-function JobsCreateContainer({ bodyshop, setBreadcrumbs, setSelectedHeader, currentUser }) {
+function JobsCreateContainer({ bodyshop, setBreadcrumbs, setSelectedHeader, currentUser, insertAuditTrail }) {
   const { t } = useTranslation();
   const notification = useNotification();
 
@@ -84,6 +86,11 @@ function JobsCreateContainer({ bodyshop, setBreadcrumbs, setSelectedHeader, curr
           newJobId: resp.data.insert_jobs.returning[0].id
         });
         logImEXEvent("manual_job_create_completed", {});
+        insertAuditTrail({
+          jobid: resp.data.insert_jobs.returning[0].id,
+          operation: AuditTrailMapping.jobmanualcreate(),
+          type: "jobmanualcreate"
+        });
         setIsSubmitting(false);
       })
       .catch((error) => {
diff --git a/client/src/translations/en_us/common.json b/client/src/translations/en_us/common.json
index d8deb99b2..33f89f2fd 100644
--- a/client/src/translations/en_us/common.json
+++ b/client/src/translations/en_us/common.json
@@ -122,7 +122,7 @@
         "billdeleted": "Bill with invoice number {{invoice_number}} deleted.",
         "billmarkforreexport": "Bill with invoice number {{invoice_number}} marked for re-export.",
         "billposted": "Bill with invoice number {{invoice_number}} posted.",
-        "billupdated": "Bill with invoice number {{invoice_number}} updated.",
+        "billupdated": "Bill with invoice number {{invoice_number}} updated with the following details: {{details}}.",
         "failedpayment": "Failed payment attempt.",
         "jobassignmentchange": "Employee {{name}} assigned to {{operation}}",
         "jobassignmentremoved": "Employee assignment removed for {{operation}}",
@@ -137,6 +137,9 @@
         "jobintake": "Job intake completed. Status set to {{status}}. Scheduled completion is {{scheduled_completion}}.",
         "jobinvoiced": "Job has been invoiced.",
         "jobioucreated": "IOU Created.",
+        "joblineupdate": "Job line {{lineDescription}} updated with the following details: {{details}}.",
+        "jobmanualcreate": "Job manually created.",
+        "jobmanuallineinsert": "Job line manually added with the following details: {{details}}.",
         "jobmodifylbradj": "Labor adjustments modified {{mod_lbr_ty}} / {{hours}}.",
         "jobnoteadded": "Note added to Job.",
         "jobnotedeleted": "Note deleted from Job.",
@@ -152,7 +155,9 @@
         "tasks_deleted": "Task '{{title}}' deleted by {{deletedBy}}",
         "tasks_uncompleted": "Task '{{title}}' uncompleted by {{uncompletedBy}}",
         "tasks_undeleted": "Task '{{title}}' undeleted by {{undeletedBy}}",
-        "tasks_updated": "Task '{{title}}' updated by {{updatedBy}}"
+        "tasks_updated": "Task '{{title}}' updated by {{updatedBy}}",
+        "timeticketcreated": "Time Ticket for {{employee}} on {{date}} created with the following details: {{details}}.",
+        "timeticketupdated": "Time Ticket for {{employee}} on {{date}} updated with the following details: {{details}}"
       }
     },
     "billlines": {
diff --git a/client/src/translations/es/common.json b/client/src/translations/es/common.json
index e888b06ae..58c7a74b5 100644
--- a/client/src/translations/es/common.json
+++ b/client/src/translations/es/common.json
@@ -122,7 +122,6 @@
         "billdeleted": "",
         "billposted": "",
         "billmarkforreexport": "",
-        "billupdated": "",
         "failedpayment": "",
         "jobassignmentchange": "",
         "jobassignmentremoved": "",
diff --git a/client/src/translations/fr/common.json b/client/src/translations/fr/common.json
index d428eab8c..e5cccbe55 100644
--- a/client/src/translations/fr/common.json
+++ b/client/src/translations/fr/common.json
@@ -122,7 +122,6 @@
         "billdeleted": "",
         "billmarkforreexport": "",
         "billposted": "",
-        "billupdated": "",
         "failedpayment": "",
         "jobassignmentchange": "",
         "jobassignmentremoved": "",
diff --git a/client/src/utils/AuditTrailMappings.js b/client/src/utils/AuditTrailMappings.js
index e33082c20..23a2600ed 100644
--- a/client/src/utils/AuditTrailMappings.js
+++ b/client/src/utils/AuditTrailMappings.js
@@ -10,7 +10,7 @@ const AuditTrailMapping = {
   billdeleted: (invoice_number) => i18n.t("audit_trail.messages.billdeleted", { invoice_number }),
   billmarkforreexport: (invoice_number) => i18n.t("audit_trail.messages.billmarkforreexport", { invoice_number }),
   billposted: (invoice_number) => i18n.t("audit_trail.messages.billposted", { invoice_number }),
-  billupdated: (invoice_number) => i18n.t("audit_trail.messages.billupdated", { invoice_number }),
+  billupdated: (invoice_number, details) => i18n.t("audit_trail.messages.billupdated", { invoice_number, details }),
   jobassignmentchange: (operation, name) => i18n.t("audit_trail.messages.jobassignmentchange", { operation, name }),
   jobassignmentremoved: (operation) => i18n.t("audit_trail.messages.jobassignmentremoved", { operation }),
   jobchecklist: (type, inproduction, status) =>
@@ -26,6 +26,10 @@ const AuditTrailMapping = {
   jobinproductionchange: (inproduction) => i18n.t("audit_trail.messages.jobinproductionchange", { inproduction }),
   jobinvoiced: () => i18n.t("audit_trail.messages.jobinvoiced"),
   jobclosedwithbypass: () => i18n.t("audit_trail.messages.jobclosedwithbypass"),
+  joblineupdate: (lineDescription, details) =>
+    i18n.t("audit_trail.messages.joblineupdate", { details, lineDescription }),
+  jobmanualcreate: () => i18n.t("audit_trail.messages.jobmanualcreate"),
+  jobmanuallineinsert: (details) => i18n.t("audit_trail.messages.jobmanuallineinsert", { details }),
   jobmodifylbradj: ({ mod_lbr_ty, hours }) => i18n.t("audit_trail.messages.jobmodifylbradj", { mod_lbr_ty, hours }),
   jobnoteadded: () => i18n.t("audit_trail.messages.jobnoteadded"),
   jobnoteupdated: () => i18n.t("audit_trail.messages.jobnoteupdated"),
@@ -72,7 +76,11 @@ const AuditTrailMapping = {
     i18n.t("audit_trail.messages.tasks_uncompleted", {
       title,
       uncompletedBy
-    })
+    }),
+  timeticketcreated: (employee, date, details) =>
+    i18n.t("audit_trail.messages.timeticketcreated", { employee, date, details }),
+  timeticketupdated: (employee, date, details) =>
+    i18n.t("audit_trail.messages.timeticketupdated", { employee, date, details })
 };
 
 export default AuditTrailMapping;
diff --git a/client/src/utils/auditTrailDetails.js b/client/src/utils/auditTrailDetails.js
new file mode 100644
index 000000000..16398267a
--- /dev/null
+++ b/client/src/utils/auditTrailDetails.js
@@ -0,0 +1,186 @@
+import dayjs from "./day";
+
+const EMPTY_VALUE = "<<empty>>";
+const NO_CHANGES = "No changes";
+
+const BILL_LINE_KEYS = ["line_desc", "quantity", "actual_price", "actual_cost", "cost_center"];
+const JOB_LINE_SKIP_KEYS = new Set(["ah_detail_line", "prt_dsmk_p"]);
+const DATE_ONLY_KEYS = new Set(["date"]);
+const DATE_TIME_KEYS = new Set(["clockon", "clockoff"]);
+const CURRENCY_KEYS = new Set(["actual_price", "actual_cost", "act_price", "db_price", "rate"]);
+const HOUR_KEYS = new Set(["productivehrs", "actualhrs", "mod_lb_hrs"]);
+
+const isBlank = (value) => value == null || value === "";
+
+const isStructuredValue = (value) => value != null && typeof value === "object" && !dayjs.isDayjs?.(value);
+
+const formatDate = (value) => (isBlank(value) ? EMPTY_VALUE : dayjs(value).format("YYYY-MM-DD"));
+
+const formatDateTime = (value) => (isBlank(value) ? EMPTY_VALUE : dayjs(value).format("YYYY-MM-DD HH:mm"));
+
+const formatNumber = (value, fractionDigits) =>
+  typeof value === "number" ? value.toFixed(fractionDigits) : String(value);
+
+const compareValue = (key, value) => {
+  if (isBlank(value)) return EMPTY_VALUE;
+  if (DATE_TIME_KEYS.has(key)) return formatDateTime(value);
+  if (DATE_ONLY_KEYS.has(key)) return formatDate(value);
+  if (dayjs.isDayjs?.(value)) return formatDateTime(value);
+  return String(value);
+};
+
+const buildFieldChangeDetails = ({ keys, original = {}, updated = {}, displayValue, skippedKeys = new Set() }) =>
+  keys
+    .filter((key) => key !== "__typename" && !skippedKeys.has(key))
+    .filter((key) => !isStructuredValue(original[key]) && !isStructuredValue(updated[key]))
+    .map((key) => {
+      if (compareValue(key, original[key]) === compareValue(key, updated[key])) return null;
+      return `${key}: ${displayValue(key, original[key])} -> ${displayValue(key, updated[key])}`;
+    })
+    .filter(Boolean);
+
+const formatBillValue = (key, value) => {
+  if (isBlank(value)) return EMPTY_VALUE;
+  if (DATE_ONLY_KEYS.has(key)) return formatDate(value);
+  if (CURRENCY_KEYS.has(key)) return typeof value === "number" ? `$${value.toFixed(2)}` : String(value);
+  return String(value);
+};
+
+const formatJobLineValue = (key, value) => {
+  if (isBlank(value)) return EMPTY_VALUE;
+  if (CURRENCY_KEYS.has(key)) return typeof value === "number" ? `$${value.toFixed(2)}` : String(value);
+  if (HOUR_KEYS.has(key)) return formatNumber(value, 1);
+  return String(value);
+};
+
+const getEmployeeName = (employeeId, employees = [], fallbackEmployee) => {
+  if (
+    (employeeId == null || fallbackEmployee?.id === employeeId) &&
+    (fallbackEmployee?.first_name || fallbackEmployee?.last_name)
+  ) {
+    return [fallbackEmployee.first_name, fallbackEmployee.last_name].filter(Boolean).join(" ");
+  }
+
+  const employee = employees.find(({ id }) => id === employeeId);
+  if (employee) {
+    return [employee.first_name, employee.last_name].filter(Boolean).join(" ");
+  }
+
+  return employeeId ? String(employeeId) : EMPTY_VALUE;
+};
+
+const formatTimeTicketValue = (key, value, { employees = [], fallbackEmployee } = {}) => {
+  if (isBlank(value)) return EMPTY_VALUE;
+  if (key === "employeeid") return getEmployeeName(value, employees, fallbackEmployee);
+  if (DATE_TIME_KEYS.has(key)) return formatDateTime(value);
+  if (DATE_ONLY_KEYS.has(key)) return formatDate(value);
+  if (CURRENCY_KEYS.has(key)) return typeof value === "number" ? `$${value.toFixed(2)}` : String(value);
+  if (HOUR_KEYS.has(key)) return formatNumber(value, 1);
+  if (typeof value === "boolean") return value ? "true" : "false";
+  return String(value);
+};
+
+const buildBillLineSummary = (line) =>
+  BILL_LINE_KEYS.map((key) => `${key}: ${formatBillValue(key, line[key])}`).join(", ");
+
+export function buildBillUpdateAuditDetails({ originalBill = {}, bill = {}, billlines = [] }) {
+  const updatedBill = { ...bill, billlines };
+  const billKeys = Array.from(new Set([...Object.keys(originalBill), ...Object.keys(updatedBill)])).filter(
+    (key) => key !== "billlines"
+  );
+
+  const changed = buildFieldChangeDetails({
+    keys: billKeys,
+    original: originalBill,
+    updated: updatedBill,
+    displayValue: formatBillValue
+  });
+
+  const originalBillLines = originalBill.billlines ?? [];
+  const updatedBillLines = updatedBill.billlines ?? [];
+
+  const addedLines = updatedBillLines
+    .filter((line) => !line.id)
+    .map((line) => `+${line.line_desc || line.description || "new line"} (${buildBillLineSummary(line)})`);
+
+  const removedLines = originalBillLines
+    .filter((line) => !updatedBillLines.some((updatedLine) => updatedLine.id === line.id))
+    .map(
+      (line) => `-${line.line_desc || line.description || line.id || "removed line"} (${buildBillLineSummary(line)})`
+    );
+
+  const modifiedLines = updatedBillLines
+    .filter((line) => line.id)
+    .flatMap((line) => {
+      const originalLine = originalBillLines.find(({ id }) => id === line.id);
+      if (!originalLine) return [];
+
+      const lineChanges = buildFieldChangeDetails({
+        keys: BILL_LINE_KEYS,
+        original: originalLine,
+        updated: line,
+        displayValue: formatBillValue
+      });
+
+      if (!lineChanges.length) return [];
+
+      return [`${line.line_desc || line.description || line.id}: ${lineChanges.join("; ")}`];
+    });
+
+  if (addedLines.length) changed.push(`billlines added: ${addedLines.join(" | ")}`);
+  if (removedLines.length) changed.push(`billlines removed: ${removedLines.join(" | ")}`);
+  if (modifiedLines.length) changed.push(`billlines modified: ${modifiedLines.join(" | ")}`);
+
+  return changed.length ? changed.join("; ") : NO_CHANGES;
+}
+
+export function buildJobLineInsertAuditDetails(values = {}) {
+  const details = Object.entries(values)
+    .filter(([key, value]) => !JOB_LINE_SKIP_KEYS.has(key) && !isBlank(value))
+    .map(([key, value]) => `${key}: ${formatJobLineValue(key, value)}`);
+
+  return details.length ? details.join("; ") : NO_CHANGES;
+}
+
+export function buildJobLineUpdateAuditDetails({ originalLine = {}, values = {} }) {
+  const details = buildFieldChangeDetails({
+    keys: Object.keys(values),
+    original: originalLine,
+    updated: values,
+    displayValue: formatJobLineValue,
+    skippedKeys: JOB_LINE_SKIP_KEYS
+  });
+
+  return details.length ? details.join("; ") : NO_CHANGES;
+}
+
+export function buildTimeTicketAuditSummary({ originalTicket = {}, submittedValues = {}, employees = [] }) {
+  const normalizedOriginal = {
+    ...originalTicket,
+    jobid: originalTicket.job?.id ?? originalTicket.jobid ?? null
+  };
+
+  const details = buildFieldChangeDetails({
+    keys: Object.keys(submittedValues),
+    original: normalizedOriginal,
+    updated: submittedValues,
+    displayValue: (key, value) =>
+      formatTimeTicketValue(key, value, {
+        employees,
+        fallbackEmployee: key === "employeeid" ? normalizedOriginal.employee : null
+      })
+  });
+
+  const employeeName = getEmployeeName(
+    submittedValues.employeeid ?? normalizedOriginal.employeeid,
+    employees,
+    normalizedOriginal.employee
+  );
+
+  return {
+    date: formatDate(submittedValues.date ?? normalizedOriginal.date),
+    details: details.length ? details.join("; ") : NO_CHANGES,
+    employeeName,
+    jobid: submittedValues.jobid ?? normalizedOriginal.jobid ?? null
+  };
+}