From 09b229541467d4b9a556f708251bd4afdd31f078 Mon Sep 17 00:00:00 2001
From: "jabber.developer2" <jabber.developer2@jabber.space>
Date: Mon, 4 May 2026 17:35:59 +0300
Subject: [PATCH] fix(export): open sqlite on demand when flatfile is active
 backend

---
 src/database.h        |  1 +
 src/database_export.c | 58 +++++++++++++++++++++++++++++++++++++++++++
 src/database_sqlite.c |  6 +++++
 3 files changed, 65 insertions(+)

diff --git a/src/database.h b/src/database.h
index 473d9f7a..c897230f 100644
--- a/src/database.h
+++ b/src/database.h
@@ -93,6 +93,7 @@ void db_sqlite_begin_transaction(void);
 void db_sqlite_end_transaction(void);
 void db_sqlite_rollback_transaction(void);
 int db_sqlite_last_changes(void);
+gboolean db_sqlite_is_open(void);
 #endif
 db_backend_t* db_backend_flatfile(void);
 
diff --git a/src/database_export.c b/src/database_export.c
index 38eb8aea..1e0b45d5 100644
--- a/src/database_export.c
+++ b/src/database_export.c
@@ -30,10 +30,12 @@
 #include "log.h"
 #include "common.h"
 #include "config/files.h"
+#include "config/accounts.h"
 #include "database.h"
 #include "database_flatfile.h"
 #include "config/preferences.h"
 #include "ui/ui.h"
+#include "xmpp/session.h"
 #include "xmpp/xmpp.h"
 #include "xmpp/message.h"
 
@@ -46,6 +48,43 @@
 // Print progress to console every N messages during export/import
 #define EXPORT_PROGRESS_INTERVAL 500
 
+// Open SQLite if it isn't already (e.g. when flatfile is the active backend
+// and sqlite was never initialised this session, or was closed by /history
+// switch). Returns 1 if we opened it (caller must close), 0 if it was already
+// open, -1 on failure.
+static int
+_ensure_sqlite_open(void)
+{
+    if (db_sqlite_is_open())
+        return 0;
+
+    db_backend_t* sqlite_be = db_backend_sqlite();
+    if (!sqlite_be || !sqlite_be->init)
+        return -1;
+
+    const char* account_name = session_get_account_name();
+    if (!account_name)
+        return -1;
+
+    ProfAccount* account = accounts_get_account(account_name);
+    if (!account)
+        return -1;
+
+    gboolean ok = sqlite_be->init(account);
+    account_free(account);
+    return ok ? 1 : -1;
+}
+
+static void
+_close_temp_sqlite(int opened)
+{
+    if (opened != 1)
+        return;
+    db_backend_t* sqlite_be = db_backend_sqlite();
+    if (sqlite_be && sqlite_be->close)
+        sqlite_be->close();
+}
+
 // =========================================================================
 // Dedup key: stanza_id if present, else hash of timestamp+from+body
 // =========================================================================
@@ -429,6 +468,15 @@ log_database_export_to_flatfile(const gchar* const contact_jid)
         return -1;
     }
 
+    // SQLite must be open for db_sqlite_list_contacts/db_sqlite_get_all_chat
+    // to return rows. When the flatfile backend is active, sqlite is closed —
+    // queries silently return NULL and the export reports zero changes.
+    int sqlite_opened = _ensure_sqlite_open();
+    if (sqlite_opened < 0) {
+        cons_show_error("Export failed: could not open SQLite database.");
+        return -1;
+    }
+
     // Determine contact list
     GSList* contacts = NULL;
     if (contact_jid) {
@@ -437,6 +485,7 @@ log_database_export_to_flatfile(const gchar* const contact_jid)
         contacts = db_sqlite_list_contacts();
         if (!contacts) {
             cons_show("No contacts found in SQLite database.");
+            _close_temp_sqlite(sqlite_opened);
             return 0;
         }
         cons_show("Exporting %d contact(s) to flat-file format...", g_slist_length(contacts));
@@ -452,6 +501,7 @@ log_database_export_to_flatfile(const gchar* const contact_jid)
     }
 
     g_slist_free_full(contacts, g_free);
+    _close_temp_sqlite(sqlite_opened);
     return total_exported;
 }
 
@@ -478,6 +528,12 @@ log_database_import_from_flatfile(const gchar* const contact_jid)
         return -1;
     }
 
+    int sqlite_opened = _ensure_sqlite_open();
+    if (sqlite_opened < 0) {
+        cons_show_error("Import failed: could not open SQLite database.");
+        return -1;
+    }
+
     // Determine contacts
     GSList* contacts = NULL;
     if (contact_jid) {
@@ -486,6 +542,7 @@ log_database_import_from_flatfile(const gchar* const contact_jid)
         contacts = _ff_list_contacts();
         if (!contacts) {
             cons_show("No flat-file history found to import.");
+            _close_temp_sqlite(sqlite_opened);
             return 0;
         }
     }
@@ -613,6 +670,7 @@ log_database_import_from_flatfile(const gchar* const contact_jid)
     }
 
     g_slist_free_full(contacts, g_free);
+    _close_temp_sqlite(sqlite_opened);
     return total_imported;
 }
 
diff --git a/src/database_sqlite.c b/src/database_sqlite.c
index 3013655a..2061c1ee 100644
--- a/src/database_sqlite.c
+++ b/src/database_sqlite.c
@@ -65,6 +65,12 @@ static gboolean _check_available_space_for_db_migration(char* path_to_db);
 
 static const int latest_version = 2;
 
+gboolean
+db_sqlite_is_open(void)
+{
+    return g_chatlog_database != NULL;
+}
+
 // Helper: close DB handle (if any), warn on busy, and shutdown SQLite
 static void
 _db_teardown(const char* ctx)