refactor: retire price_events.json completely — DB is the only store

User directive: no JSON, retire it fully, fix all related code.

Changes:
- price_monitor.py: record_event writes DB only; removed EVENTS_PATH/
  load_events/save_events entirely
- strategy_feedback.py: price events read from DB only (removed JSON fallback)
- system_health_check.py: removed price_events.json from file-check list,
  DB-only event stats (was showing 0/0 due to wrong-DB resolution)
- mo_config.py: removed dead price_events_path property (no callers)
- mofin_health.py: price_events freshness reads DB table (authoritative now)
- mofin_db.py: DATA_DIR/DB_PATH now ABSOLUTE (/home/hmo/MoFin/data) —
  was relative __file__.parent, so each hardlinked copy of mofin_db.py
  resolved to a DIFFERENT database (canonical vs web-dashboard vs
  profile-local third DB with 0 rows of everything except market_snapshots).
  This fragmentation was the real cause of health checks reading empty tables.
- Unified all 4 mofin_db copies (root/scripts/deploy/profile) via hardlink
- price_events.json archived to trashbox (fully backfilled: 6353 rows in DB)

Verified:
- record_event lands in DB only, JSON not recreated
- system_health_check: 历史事件 6353 / 今日事件 2965 (was 0/0)
- strategy_feedback + price_monitor full runs clean

deploy/profile-scripts/system_health_check.py

@@ -9,7 +9,6 @@ from datetime import datetime, timedelta
 from pathlib import Path
 
 DATA_DIR = Path("/home/hmo/web-dashboard/data")
-EVENTS_PATH = DATA_DIR / "price_events.json"
 EVALUATION_PATH = DATA_DIR / "evaluation.json"
 ACCURACY_PATH = DATA_DIR / "accuracy_stats.json"
 CRON_JOBS = "/home/hmo/.hermes/profiles/position-analyst/cron/jobs.json"
@@ -104,10 +103,9 @@ def run():
         lines.append(check(False, "MoFin DB 数据读取失败"))
         warn_count += 3
 
-    # 仍为 JSON 文件的检查
+    # 仍为 JSON 文件的检查（price_events 已迁移到 DB 表，不在此列）
     files = {
         "market.json": DATA_DIR / "market.json",
-        "price_events.json": EVENTS_PATH,
         "evaluation.json": EVALUATION_PATH,
         "accuracy_stats.json": ACCURACY_PATH,
     }
@@ -121,7 +119,7 @@ def run():
         else:
             ok_count += 1
 
-    # 4. 价格事件统计
+    # 4. 价格事件统计（只读 DB price_events 表，JSON 已退役）
     lines.append("")
     lines.append("【价格事件】")
     try:
@@ -130,10 +128,12 @@ def run():
         ev_list = query_price_events(conn, limit=50000)
         today_events = query_price_events_by_date(conn, now.strftime("%Y-%m-%d"))
         conn.close()
-    except Exception:
-        events = load_json(EVENTS_PATH, {"events": []})
-        ev_list = events.get("events", [])
-        today_events = [e for e in ev_list if e.get("date") == now.strftime("%Y-%m-%d")]
+    except Exception as e:
+        ev_list = []
+        today_events = []
+        lines.append(check(False, f"DB价格事件读取失败: {str(e)[:60]}"))
+        issues.append(f"price_events DB读取失败: {str(e)[:60]}")
+        warn_count += 1
     lines.append(check(len(ev_list) > 0, f"历史事件: {len(ev_list)}条"))
     lines.append(check(len(today_events) > 0, f"今日事件: {len(today_events)}条"))
     if len(ev_list) == 0: