Warn if interval is short

monitoring/db/scripts/get_detailed_power.py

@@ -204,8 +204,23 @@ class App:
 		self.config = config
 		self.db = MonitoringDB(self.config.verbose)
 
+	@staticmethod
+	def warnings(config):
+		warn = ""
+		if config.interval < 5: 
+			warn += '# Warning: interval<5 is very small and may lead to data gaps.'
+		return warn
+	
 	def run_all(self):
-		header = f"# {config.datetime}: {config.cmd}\n#\n"
+		warnings = self.warnings(self.config)
+		if warnings:
+			print(warnings)
+
+		header = f"# {config.datetime}: {config.cmd}\n"
+		if warnings:
+			header +=  f"{warnings}\n"
+		header += "#\n"
+
 		for jobid in self.config.jobid:
 			try:
 				power = Power.from_db(self.db, jobid, self.config.interval)