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# TODO: filter on last_scheduled "too recent" to avoid always		# TODO: filter on last_scheduled "too recent" to avoid always
# re-scheduling the same tasks.		# re-scheduling the same tasks.
where_clauses = [		where_clauses = [
"enabled", # "NOT enabled" = the lister said the origin no longer exists		"enabled", # "NOT enabled" = the lister said the origin no longer exists
"visit_type = %s",		"visit_type = %s",
]		]
if policy == "oldest_scheduled_first":		if policy == "oldest_scheduled_first":
order_by = "origin_visit_stats.last_scheduled NULLS FIRST"		order_by = "origin_visit_stats.last_scheduled NULLS FIRST"
		elif policy == "never_visited_oldest_update_first":
		# never visited origins have a NULL last_snapshot
		where_clauses.append("origin_visit_stats.last_snapshot IS NULL")

		# order by increasing last_update (oldest first)
		where_clauses.append("listed_origins.last_update IS NOT NULL")
		order_by = "listed_origins.last_update"
else:		else:
raise UnknownPolicy(f"Unknown scheduling policy {policy}")		raise UnknownPolicy(f"Unknown scheduling policy {policy}")

select_query = f"""		select_query = f"""
SELECT		SELECT
{origin_select_cols}		{origin_select_cols}
FROM		FROM
listed_origins		listed_origins
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