feat: issue tags management (add/remove/list-all)

app/main.py

@@ -728,3 +728,47 @@ def unlink_issues(child_id: int, db: Session = Depends(get_db)):
 @app.get("/issues/{issue_id}/children", response_model=List[schemas.IssueResponse])
 def get_children(issue_id: int, db: Session = Depends(get_db)):
     return db.query(models.Issue).filter(models.Issue.depends_on_id == issue_id).all()
+
+
+
+# ============ Issue Tags ============
+
+@app.post("/issues/{issue_id}/tags")
+def add_tag(issue_id: int, tag: str, db: Session = Depends(get_db)):
+    issue = db.query(models.Issue).filter(models.Issue.id == issue_id).first()
+    if not issue:
+        raise HTTPException(status_code=404, detail="Issue not found")
+    current = set(issue.tags.split(",")) if issue.tags else set()
+    current.add(tag.strip())
+    current.discard("")
+    issue.tags = ",".join(sorted(current))
+    db.commit()
+    return {"issue_id": issue_id, "tags": list(current)}
+
+
+@app.delete("/issues/{issue_id}/tags")
+def remove_tag(issue_id: int, tag: str, db: Session = Depends(get_db)):
+    issue = db.query(models.Issue).filter(models.Issue.id == issue_id).first()
+    if not issue:
+        raise HTTPException(status_code=404, detail="Issue not found")
+    current = set(issue.tags.split(",")) if issue.tags else set()
+    current.discard(tag.strip())
+    current.discard("")
+    issue.tags = ",".join(sorted(current)) if current else None
+    db.commit()
+    return {"issue_id": issue_id, "tags": list(current)}
+
+
+@app.get("/tags")
+def list_all_tags(project_id: int = None, db: Session = Depends(get_db)):
+    """Get all unique tags across issues."""
+    query = db.query(models.Issue.tags).filter(models.Issue.tags != None)
+    if project_id:
+        query = query.filter(models.Issue.project_id == project_id)
+    all_tags = set()
+    for (tags,) in query.all():
+        for t in tags.split(","):
+            t = t.strip()
+            if t:
+                all_tags.add(t)
+    return {"tags": sorted(all_tags)}