Refactor blocklist log retrieval via service layer and add fail2ban DB repo

backend/app/services/blocklist_service.py

@@ -21,6 +21,8 @@ import structlog
 
 from app.models.blocklist import (
     BlocklistSource,
+    ImportLogEntry,
+    ImportLogListResponse,
     ImportRunResult,
     ImportSourceResult,
     PreviewResponse,
@@ -503,6 +505,38 @@ async def get_schedule_info(
     )
 
 
+async def list_import_logs(
+    db: aiosqlite.Connection,
+    *,
+    source_id: int | None = None,
+    page: int = 1,
+    page_size: int = 50,
+) -> ImportLogListResponse:
+    """Return a paginated list of import log entries.
+
+    Args:
+        db: Active application database connection.
+        source_id: Optional filter to only return logs for a specific source.
+        page: 1-based page number.
+        page_size: Items per page.
+
+    Returns:
+        :class:`~app.models.blocklist.ImportLogListResponse`.
+    """
+    items, total = await import_log_repo.list_logs(
+        db, source_id=source_id, page=page, page_size=page_size
+    )
+    total_pages = import_log_repo.compute_total_pages(total, page_size)
+
+    return ImportLogListResponse(
+        items=[ImportLogEntry.model_validate(i) for i in items],
+        total=total,
+        page=page,
+        page_size=page_size,
+        total_pages=total_pages,
+    )
+
+
 # ---------------------------------------------------------------------------
 # Internal helpers
 # ---------------------------------------------------------------------------