ircd:Ⓜ️:sync: Add an initial phase convenience; add account_data as an initial phase.

include/ircd/m/sync.h

@@ -52,6 +52,7 @@ struct ircd::m::sync::item
 	json::strung feature;
 	json::object opts;
 	bool phased;
+	bool initial;
 
   public:
 	string_view name() const;

ircd/m.cc

@@ -861,6 +861,10 @@ ircd::m::sync::item::item(std::string name,
 {
 	opts.get<bool>("phased", false)
 }
+,initial
+{
+	opts.get<bool>("initial", false)
+}
 {
 	log::debug
 	{
@@ -891,7 +895,11 @@ try
 		return false;
 
 	// Skip the item for phased-sync ranges if it's not phased-sync aware.
-	if(!phased && data.phased)
+	if(data.phased && !phased && !initial)
+		return false;
+
+	// Skip the item for phased-sync ranges after initial sync if it has initial=true
+	if(data.phased && initial && int64_t(data.range.first) < 0L)
 		return false;
 
 	#ifdef RB_DEBUG

modules/client/sync/account_data.cc

@@ -28,7 +28,10 @@ ircd::m::sync::account_data
 {
 	"account_data",
 	account_data_polylog,
-	account_data_linear
+	account_data_linear,
+	{
+		{ "initial", true }
+	}
 };
 
 bool