rework from modal to page

backend/src/services/issue.service.ts

@@ -188,6 +188,40 @@ async function updateIssue(
   }
 }
 
+async function addHistoryEntry(
+  issueId: number,
+  aktion: string,
+  details: Record<string, unknown> | null,
+  userId?: string,
+) {
+  try {
+    await pool.query(
+      `INSERT INTO issue_historie (issue_id, aktion, details, erstellt_von)
+       VALUES ($1, $2, $3, $4)`,
+      [issueId, aktion, details ? JSON.stringify(details) : null, userId || null],
+    );
+  } catch (error) {
+    logger.error('IssueService.addHistoryEntry failed', { error, issueId });
+  }
+}
+
+async function getHistory(issueId: number) {
+  try {
+    const result = await pool.query(
+      `SELECT h.*, u.name AS erstellt_von_name
+       FROM issue_historie h
+       LEFT JOIN users u ON u.id = h.erstellt_von
+       WHERE h.issue_id = $1
+       ORDER BY h.erstellt_am DESC`,
+      [issueId],
+    );
+    return result.rows;
+  } catch (error) {
+    logger.error('IssueService.getHistory failed', { error, issueId });
+    return [];
+  }
+}
+
 async function deleteIssue(id: number) {
   try {
     const result = await pool.query(
@@ -575,6 +609,8 @@ export default {
   getAssignableMembers,
   getIssueCounts,
   getIssueStatuses,
+  addHistoryEntry,
+  getHistory,
   createIssueStatus,
   updateIssueStatus,
   deleteIssueStatus,