Stage 9: ban history — backend service, router, frontend history page

- history.py models: HistoryBanItem, HistoryListResponse, IpTimelineEvent, IpDetailResponse
- history_service.py: list_history() with dynamic WHERE clauses (range/jail/ip
  prefix/all-time), get_ip_detail() with timeline aggregation
- history.py router: GET /api/history + GET /api/history/{ip} (404 for unknown)
- Fixed latent bug in ban_service._parse_data_json: json.loads('null') -> None
  -> AttributeError; now checks isinstance(parsed, dict) before assigning obj
- 317 tests pass (27 new), ruff + mypy clean (46 files)
- types/history.ts, api/history.ts, hooks/useHistory.ts created
- HistoryPage.tsx: filter bar (time range/jail/IP), DataGrid table,
  high-ban-count row highlighting, per-IP IpDetailView with timeline,
  pagination
- Frontend tsc + ESLint clean (0 errors/warnings)
- Tasks.md Stage 9 marked done

frontend/src/types/history.ts

@@ -0,0 +1,59 @@
+/**
+ * TypeScript types for the ban history API.
+ */
+
+/** Optional time-range filter for history queries. */
+export type TimeRange = "24h" | "7d" | "30d" | "365d";
+
+/** A single row in the history ban-list table. */
+export interface HistoryBanItem {
+  ip: string;
+  jail: string;
+  banned_at: string;
+  ban_count: number;
+  failures: number;
+  matches: string[];
+  country_code: string | null;
+  country_name: string | null;
+  asn: string | null;
+  org: string | null;
+}
+
+/** Paginated response from GET /api/history */
+export interface HistoryListResponse {
+  items: HistoryBanItem[];
+  total: number;
+  page: number;
+  page_size: number;
+}
+
+/** A single ban event in a per-IP timeline. */
+export interface IpTimelineEvent {
+  jail: string;
+  banned_at: string;
+  ban_count: number;
+  failures: number;
+  matches: string[];
+}
+
+/** Full historical record for a single IP address. */
+export interface IpDetailResponse {
+  ip: string;
+  total_bans: number;
+  total_failures: number;
+  last_ban_at: string | null;
+  country_code: string | null;
+  country_name: string | null;
+  asn: string | null;
+  org: string | null;
+  timeline: IpTimelineEvent[];
+}
+
+/** Query parameters supported by GET /api/history */
+export interface HistoryQuery {
+  range?: TimeRange;
+  jail?: string;
+  ip?: string;
+  page?: number;
+  page_size?: number;
+}