Add industry collection and six-month job tracking

templates/jd-note.md

@@ -10,6 +10,11 @@ source_name:
 source_quality: official / job-board / social / secondary / unknown
 collected_at: YYYY-MM-DD
 posted_at:
+first_seen_at:
+last_checked_at:
+snapshot_type: new / changed / unchanged / expired
+job_code:
+previous_snapshot:
 status: active / expired / unknown
 level:
 team:
@@ -37,6 +42,14 @@ relevance: high / medium / low
 - collected_at:
 - availability:
 
+## Change Snapshot
+
+- first_seen_at:
+- last_checked_at:
+- snapshot_type:
+- previous_snapshot:
+- changed_fields:
+
 ## Raw JD Summary
 
 用自己的话概括岗位职责、任职要求和加分项。