Complete history archive support for dashboard/map data and mark task finished

Add source=archive option for dashboard endpoints and history service; update Docs/Tasks.md; include archive branch for list_bans, bans_by_country, ban_trend, bans_by_jail; tests for archive paths.

backend/app/db.py

@@ -75,6 +75,20 @@ CREATE TABLE IF NOT EXISTS geo_cache (
 );
 """
 
+_CREATE_HISTORY_ARCHIVE: str = """
+CREATE TABLE IF NOT EXISTS history_archive (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    jail        TEXT    NOT NULL,
+    ip          TEXT    NOT NULL,
+    timeofban   INTEGER NOT NULL,
+    bancount    INTEGER NOT NULL,
+    data        TEXT    NOT NULL,
+    action      TEXT    NOT NULL CHECK(action IN ('ban', 'unban')),
+    created_at  TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    UNIQUE(ip, jail, action, timeofban)
+);
+"""
+
 # Ordered list of DDL statements to execute on initialisation.
 _SCHEMA_STATEMENTS: list[str] = [
     _CREATE_SETTINGS,
@@ -83,6 +97,7 @@ _SCHEMA_STATEMENTS: list[str] = [
     _CREATE_BLOCKLIST_SOURCES,
     _CREATE_IMPORT_LOG,
     _CREATE_GEO_CACHE,
+    _CREATE_HISTORY_ARCHIVE,
 ]