Bumping base cache numbers for master (#5451)

model/channel.go

@@ -19,6 +19,7 @@ const (
 	CHANNEL_NAME_MAX_LENGTH        = 64
 	CHANNEL_HEADER_MAX_RUNES       = 1024
 	CHANNEL_PURPOSE_MAX_RUNES      = 250
+	CHANNEL_CACHE_SIZE             = 25000
 )
 
 type Channel struct {