Merge pull request 'Allow current-region takeover of empty draining locks' (#14) from feature/account-lock-session-end-fix into main

Reviewed-on: #14

backend/app.py

@@ -712,7 +712,18 @@ def newserv_account_lock_acquire():
                         "lock": lock_row_payload(row),
                     })
 
+                sessions = row["sessions"] or {}
+                if isinstance(sessions, str):
+                    sessions = json.loads(sessions)
+
                 if row["holder_source"] != source:
+                    target_region_current = False
+                    if row["state"] == "draining" and not sessions and source_region:
+                        _all_current, sync = account_sync_current_on_all_regions(account_id)
+                        region_status = (sync.get("regions") or {}).get(source_region) or {}
+                        target_region_current = region_status.get("status") == "current"
+
+                    if not target_region_current:
                         return jsonify({
                             "ok": False,
                             "message": f"$C6Account is already active\\non {row['holder_source']}.",
@@ -721,14 +732,12 @@ def newserv_account_lock_acquire():
                             "lock": lock_row_payload(row),
                         })
 
-                sessions = row["sessions"] or {}
-                if isinstance(sessions, str):
-                    sessions = json.loads(sessions)
                 sessions[session_nonce] = session_info
 
                 cur.execute("""
                     UPDATE account_session_locks
-                    SET state = 'active',
+                    SET holder_source = %s,
+                        state = 'active',
                         source_region = %s,
                         source_ship = %s,
                         account_store = %s,
@@ -739,6 +748,7 @@ def newserv_account_lock_acquire():
                     RETURNING account_id, holder_source, source_region, source_ship,
                               account_store, state, sessions, created_at, updated_at, expires_at
                 """, (
+                    source,
                     source_region,
                     source_ship,
                     account_store,