Fix CI timezone and fresh settings initialization

backend/app/migrations.py

@@ -1,14 +1,32 @@
 from pathlib import Path
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from .db import db, utc_now
 
 
+def _normalize_timezone(value: str) -> str:
+    timezone_name = value.strip()
+    if not timezone_name:
+        return "UTC"
+    if timezone_name.startswith("/"):
+        marker = "/zoneinfo/"
+        if marker in timezone_name:
+            timezone_name = timezone_name.split(marker, 1)[1]
+        else:
+            timezone_name = timezone_name.lstrip("/")
+    try:
+        ZoneInfo(timezone_name)
+    except (ValueError, ZoneInfoNotFoundError):
+        return "UTC"
+    return timezone_name
+
+
 def _system_timezone() -> str:
     timezone_file = Path("/etc/timezone")
     if timezone_file.exists():
         value = timezone_file.read_text().strip()
         if value:
-            return value
+            return _normalize_timezone(value)
     return "UTC"
 
 
@@ -147,3 +165,17 @@ def run_migrations() -> None:
                 "INSERT INTO schema_migrations(version, applied_at) VALUES (?, ?)",
                 (3, now),
             )
+        if 4 not in applied:
+            now = utc_now()
+            row = conn.execute("SELECT value FROM settings WHERE key = 'timezone'").fetchone()
+            if row:
+                normalized_timezone = _normalize_timezone(row["value"])
+                if normalized_timezone != row["value"]:
+                    conn.execute(
+                        "UPDATE settings SET value = ?, updated_at = ? WHERE key = 'timezone'",
+                        (normalized_timezone, now),
+                    )
+            conn.execute(
+                "INSERT INTO schema_migrations(version, applied_at) VALUES (?, ?)",
+                (4, now),
+            )