rework from modal to page

backend/src/database/migrations/059_issue_historie.sql

@@ -0,0 +1,11 @@
+-- Issue change history
+CREATE TABLE IF NOT EXISTS issue_historie (
+  id SERIAL PRIMARY KEY,
+  issue_id INT NOT NULL REFERENCES issues(id) ON DELETE CASCADE,
+  aktion VARCHAR(100) NOT NULL,
+  details JSONB,
+  erstellt_von UUID REFERENCES users(id),
+  erstellt_am TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_issue_historie_issue_id ON issue_historie(issue_id);