Raise max setting of checkpoint_timeout to 1d

Previously checkpoint_timeout was capped at 3600s
New max setting is 86400s = 24h = 1d

Discussion: 32558.1454471895@sss.pgh.pa.us

Author: simonat2ndQuadrant

doc/src/sgml/config.sgml

@@ -2614,7 +2614,7 @@ include_dir 'conf.d'
       <listitem>
        <para>
         Maximum time between automatic WAL checkpoints, in seconds.
-        The valid range is between 30 seconds and one hour.
+        The valid range is between 30 seconds and one day.
         The default is five minutes (<literal>5min</>).
         Increasing this parameter can increase the amount of time needed
         for crash recovery.

src/backend/utils/misc/guc.c

@@ -2250,7 +2250,7 @@ static struct config_int ConfigureNamesInt[] =
 			GUC_UNIT_S
 		},
 		&CheckPointTimeout,
-		300, 30, 3600,
+		300, 30, 86400,
 		NULL, NULL, NULL
 	},
 

src/backend/utils/misc/postgresql.conf.sample

@@ -203,7 +203,7 @@
 
 # - Checkpoints -
 
-#checkpoint_timeout = 5min		# range 30s-1h
+#checkpoint_timeout = 5min		# range 30s-1d
 #max_wal_size = 1GB
 #min_wal_size = 80MB
 #checkpoint_completion_target = 0.5	# checkpoint target duration, 0.0 - 1.0