Add configurable seven-day DM custody TTL and reserved storage quota

src/chat/chat_setting.c

@@ -47,6 +47,8 @@ static const struct chat_setting_def g_setting_defs[] = {
     {"radio_vad_hangover_ms",       CHAT_SETTING_INT,  200, 50, 2000},/* тишина до авто-отбоя */
     {"media_download_max_peers",    CHAT_SETTING_INT,  3,   1, 16},
     {"storage_backfill_days",       CHAT_SETTING_INT,  7,   1, 365},
+    {"dm_media_ttl_sec",            CHAT_SETTING_INT, 604800, 1, 31536000}, /* TTL custody M: 7 суток */
+    {"dm_media_storage_mb",         CHAT_SETTING_INT, 1024, 1, 1048576}, /* включая зарезервированные загрузки */
     {"standby_active_sec",         CHAT_SETTING_INT,  2,   1, 3600},
     {"standby_sleep_sec",          CHAT_SETTING_INT,  60,  1, 86400},
     {"standby_min_sleep_sec",      CHAT_SETTING_INT,  15,  1, 86400},

src/dm/dm_media_priv.h

@@ -0,0 +1,16 @@
+/* Внутренние SQL/control операции двух владельцев DM media; снаружи не использовать. */
+#ifndef DM_MEDIA_PRIV_H
+#define DM_MEDIA_PRIV_H
+
+#include "dm_media.h"
+#include "dm_core.h"
+#include <sqlite3.h>
+
+#define DM_MEDIA_BODY_MAX (DM_MSG_FIXED_HDR + 255 + 2 + DM_DATA_MAX + 16 + DM_MEDIA_DESC_SIZE + DM_MSG_SIG_SIZE)
+
+sqlite3_stmt* dm_media_prepare(struct UTUN_INSTANCE* inst, const char* sql);
+int dm_media_step(struct UTUN_INSTANCE* inst, sqlite3_stmt* st);
+int dm_media_exec(struct UTUN_INSTANCE* inst, const char* sql);
+struct dm_mb_media* dm_mailbox_get_media(struct UTUN_INSTANCE* inst);
+
+#endif