ssb: Expose last successful connection time for stored connections.

src/ssb.db.h

@@ -340,6 +340,10 @@ typedef struct _tf_ssb_db_stored_connection_t
 	int port;
 	/** The identity. */
 	char pubkey[k_id_base64_len];
+	/** Time of last attempted connection. */
+	int64_t last_attempt;
+	/** Time of last successful connection. */
+	int64_t last_success;
 } tf_ssb_db_stored_connection_t;
 
 /**