Harden backup import and restore coverage

4 files changed, 40 insertions, 0 deletions

diff --git a/src/mcp/tools/common/history.c b/src/mcp/tools/common/history.c
index 9f08e84..0e600d4 100644
--- a/src/mcp/tools/common/history.c
+++ b/src/mcp/tools/common/history.c
@@ -245,6 +245,25 @@ tiny_history_index_build(const tiny_store_t *store)
   return index;
 }
 
+uint64_t
+tiny_history_index_memory_estimate(const tiny_history_index_t *index)
+{
+  uint64_t total;
+  size_t position;
+  if (!index)
+    {
+      return 0;
+    }
+  total = sizeof(*index) + index->capacity * sizeof(*index->buckets)
+          + index->slot_capacity * sizeof(*index->slots);
+  for (position = 0; position < index->count; ++position)
+    {
+      total += strlen(index->buckets[position].session_id) + 1;
+      total += index->buckets[position].capacity * sizeof(*index->buckets[position].entries);
+    }
+  return total;
+}
+
 void
 tiny_history_index_free(tiny_history_index_t *index)
 {
diff --git a/src/mcp/tools/common/history.h b/src/mcp/tools/common/history.h
index 3b23027..ed7d11a 100644
--- a/src/mcp/tools/common/history.h
+++ b/src/mcp/tools/common/history.h
@@ -20,6 +20,7 @@ bool tiny_history_index_session(const tiny_history_index_t *index,
                                 const size_t **entries,
                                 size_t *count);
 size_t tiny_history_index_session_count(const tiny_history_index_t *index);
+uint64_t tiny_history_index_memory_estimate(const tiny_history_index_t *index);
 bool tiny_history_index_session_at(const tiny_history_index_t *index,
                                    size_t position,
                                    const char **session_id,
diff --git a/src/mcp/tools/common/memory_index.c b/src/mcp/tools/common/memory_index.c
index e3841e2..32a97d1 100644
--- a/src/mcp/tools/common/memory_index.c
+++ b/src/mcp/tools/common/memory_index.c
@@ -165,6 +165,25 @@ tiny_memory_index_build(const tiny_store_t *store)
   return index;
 }
 
+uint64_t
+tiny_memory_index_memory_estimate(const tiny_memory_index_t *index)
+{
+  uint64_t total;
+  size_t position;
+  if (!index)
+    {
+      return 0;
+    }
+  total = sizeof(*index) + index->count * sizeof(*index->buckets)
+          + index->slot_capacity * sizeof(*index->slots);
+  for (position = 0; position < index->count; ++position)
+    {
+      total += index->buckets[position].incoming_capacity
+               * sizeof(*index->buckets[position].incoming);
+    }
+  return total;
+}
+
 void
 tiny_memory_index_free(tiny_memory_index_t *index)
 {
diff --git a/src/mcp/tools/common/memory_index.h b/src/mcp/tools/common/memory_index.h
index fbe43a7..71e450d 100644
--- a/src/mcp/tools/common/memory_index.h
+++ b/src/mcp/tools/common/memory_index.h
@@ -20,5 +20,6 @@ bool tiny_memory_index_incoming(const tiny_memory_index_t *index,
                                 const char *message_id,
                                 const tiny_relation_reference_t **references,
                                 size_t *count);
+uint64_t tiny_memory_index_memory_estimate(const tiny_memory_index_t *index);
 
 #endif