diff --git a/.gitignore b/.gitignore
index 0268d5d3..7a477b03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ sift/
 *.bin
 *.out
 venv/
+.venv
 
 vendor/
 dist/
diff --git a/Makefile b/Makefile
index 43e1d980..76121720 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,9 @@ endif
 
 ifdef CONFIG_DARWIN
 LOADABLE_EXTENSION=dylib
+# Let unresolved SQLite symbols resolve against host at load time
+# This is standard for SQLite loadable extensions on macOS.
+CFLAGS += -undefined dynamic_lookup
 endif
 
 ifdef CONFIG_LINUX
@@ -193,6 +196,10 @@ test-loadable: loadable
 test-loadable-snapshot-update: loadable
 	$(PYTHON) -m pytest -vv tests/test-loadable.py --snapshot-update
 
+# Update snapshots for all loadable tests (use after intentional behavior changes)
+test-snapshots-update: loadable
+	$(PYTHON) -m pytest -vv tests/test-*.py --snapshot-update
+
 test-loadable-watch:
 	watchexec --exts c,py,Makefile --clear -- make test-loadable
 
diff --git a/sqlite-vec.c b/sqlite-vec.c
index 3cc802f0..4d36bb83 100644
--- a/sqlite-vec.c
+++ b/sqlite-vec.c
@@ -8434,6 +8434,101 @@ int vec0Update_Delete_DeleteRowids(vec0_vtab *p, i64 rowid) {
   return rc;
 }
 
+// Clear the rowid slot in v_chunks.rowids for the given chunk/offset
+int vec0Update_Delete_ClearRowid(vec0_vtab *p, i64 chunk_id, i64 chunk_offset) {
+  int rc;
+  sqlite3_blob *blobChunksRowids = NULL;
+
+  rc = sqlite3_blob_open(p->db, p->schemaName, p->shadowChunksName, "rowids",
+                         chunk_id, 1, &blobChunksRowids);
+  if (rc != SQLITE_OK) {
+    vtab_set_error(&p->base, "could not open rowids blob for %s.%s.%lld",
+                   p->schemaName, p->shadowChunksName, chunk_id);
+    return SQLITE_ERROR;
+  }
+
+  i64 expected = p->chunk_size * sizeof(i64);
+  i64 actual = sqlite3_blob_bytes(blobChunksRowids);
+  if (expected != actual) {
+    vtab_set_error(&p->base,
+                   VEC_INTERAL_ERROR
+                   "rowids blob size mismatch on %s.%s.%lld. Expected %lld, actual %lld",
+                   p->schemaName, p->shadowChunksName, chunk_id, expected, actual);
+    sqlite3_blob_close(blobChunksRowids);
+    return SQLITE_ERROR;
+  }
+
+  i64 zero = 0;
+  rc = sqlite3_blob_write(blobChunksRowids, &zero, sizeof(i64),
+                          chunk_offset * sizeof(i64));
+  int brc = sqlite3_blob_close(blobChunksRowids);
+  if (rc != SQLITE_OK) {
+    vtab_set_error(&p->base, "could not write rowids blob on %s.%s.%lld",
+                   p->schemaName, p->shadowChunksName, chunk_id);
+    return rc;
+  }
+  if (brc != SQLITE_OK) {
+    vtab_set_error(&p->base,
+                   "could not close rowids blob on %s.%s.%lld",
+                   p->schemaName, p->shadowChunksName, chunk_id);
+    return brc;
+  }
+  return SQLITE_OK;
+}
+
+// Clear the vector bytes for each vector column at the given chunk/offset
+int vec0Update_Delete_ClearVectors(vec0_vtab *p, i64 chunk_id, i64 chunk_offset) {
+  for (int i = 0; i < p->numVectorColumns; i++) {
+    int rc;
+    sqlite3_blob *blobVectors = NULL;
+
+    rc = sqlite3_blob_open(p->db, p->schemaName, p->shadowVectorChunksNames[i],
+                           "vectors", chunk_id, 1, &blobVectors);
+    if (rc != SQLITE_OK) {
+      vtab_set_error(&p->base, "Could not open vectors blob for %s.%s.%lld",
+                     p->schemaName, p->shadowVectorChunksNames[i], chunk_id);
+      return rc;
+    }
+
+    i64 expected = p->chunk_size * vector_column_byte_size(p->vector_columns[i]);
+    i64 actual = sqlite3_blob_bytes(blobVectors);
+    if (expected != actual) {
+      vtab_set_error(&p->base,
+                     VEC_INTERAL_ERROR
+                     "vector blob size mismatch on %s.%s.%lld. Expected %lld, actual %lld",
+                     p->schemaName, p->shadowVectorChunksNames[i], chunk_id, expected, actual);
+      sqlite3_blob_close(blobVectors);
+      return SQLITE_ERROR;
+    }
+
+    size_t nbytes = vector_column_byte_size(p->vector_columns[i]);
+    void *zeros = sqlite3_malloc(nbytes);
+    if (!zeros) {
+      sqlite3_blob_close(blobVectors);
+      return SQLITE_NOMEM;
+    }
+    memset(zeros, 0, nbytes);
+    rc = vec0_write_vector_to_vector_blob(blobVectors, chunk_offset, zeros,
+                                          p->vector_columns[i].dimensions,
+                                          p->vector_columns[i].element_type);
+    sqlite3_free(zeros);
+
+    int brc = sqlite3_blob_close(blobVectors);
+    if (rc != SQLITE_OK) {
+      vtab_set_error(&p->base, "Could not write to vectors blob for %s.%s.%lld",
+                     p->schemaName, p->shadowVectorChunksNames[i], chunk_id);
+      return rc;
+    }
+    if (brc != SQLITE_OK) {
+      vtab_set_error(&p->base,
+                     "Could not commit blob transaction for vectors blob for %s.%s.%lld",
+                     p->schemaName, p->shadowVectorChunksNames[i], chunk_id);
+      return brc;
+    }
+  }
+  return SQLITE_OK;
+}
+
 int vec0Update_Delete_DeleteAux(vec0_vtab *p, i64 rowid) {
   int rc;
   sqlite3_stmt *stmt = NULL;
@@ -8574,9 +8669,17 @@ int vec0Update_Delete(sqlite3_vtab *pVTab, sqlite3_value *idValue) {
 
   // 3. zero out rowid in chunks.rowids
   // https://github.com/asg017/sqlite-vec/issues/54
+  rc = vec0Update_Delete_ClearRowid(p, chunk_id, chunk_offset);
+  if (rc != SQLITE_OK) {
+    return rc;
+  }
 
   // 4. zero out any data in vector chunks tables
   // https://github.com/asg017/sqlite-vec/issues/54
+  rc = vec0Update_Delete_ClearVectors(p, chunk_id, chunk_offset);
+  if (rc != SQLITE_OK) {
+    return rc;
+  }
 
   // 5. delete from _rowids table
   rc = vec0Update_Delete_DeleteRowids(p, rowid);
diff --git a/tests/__snapshots__/test-auxiliary.ambr b/tests/__snapshots__/test-auxiliary.ambr
index bfe3d2c9..66a3ef3a 100644
--- a/tests/__snapshots__/test-auxiliary.ambr
+++ b/tests/__snapshots__/test-auxiliary.ambr
@@ -137,7 +137,7 @@
           'chunk_id': 1,
           'size': 8,
           'validity': b'\x06',
-          'rowids': b'\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'rowids': b'\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
@@ -163,7 +163,7 @@
       'rows': list([
         OrderedDict({
           'rowid': 1,
-          'vectors': b'\x00\x00\x80?\x00\x00\x00@\x00\x00@@\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'vectors': b'\x00\x00\x00\x00\x00\x00\x00@\x00\x00@@\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
diff --git a/tests/__snapshots__/test-general.ambr b/tests/__snapshots__/test-general.ambr
index 0eac460f..ddae7aa0 100644
--- a/tests/__snapshots__/test-general.ambr
+++ b/tests/__snapshots__/test-general.ambr
@@ -126,7 +126,7 @@
     'rows': list([
       OrderedDict({
         'schema': 'main',
-        'name': 'v_auxiliary',
+        'name': 'v_metadatatext00',
         'type': 'shadow',
         'ncol': 2,
         'wr': 0,
@@ -134,39 +134,39 @@
       }),
       OrderedDict({
         'schema': 'main',
-        'name': 'v_chunks',
+        'name': 'v_metadatachunks00',
         'type': 'shadow',
-        'ncol': 6,
+        'ncol': 2,
         'wr': 0,
         'strict': 0,
       }),
       OrderedDict({
         'schema': 'main',
-        'name': 'v_info',
+        'name': 'v_rowids',
         'type': 'shadow',
-        'ncol': 2,
+        'ncol': 4,
         'wr': 0,
         'strict': 0,
       }),
       OrderedDict({
         'schema': 'main',
-        'name': 'v_rowids',
+        'name': 'v_auxiliary',
         'type': 'shadow',
-        'ncol': 4,
+        'ncol': 2,
         'wr': 0,
         'strict': 0,
       }),
       OrderedDict({
         'schema': 'main',
-        'name': 'v_metadatachunks00',
+        'name': 'v_chunks',
         'type': 'shadow',
-        'ncol': 2,
+        'ncol': 6,
         'wr': 0,
         'strict': 0,
       }),
       OrderedDict({
         'schema': 'main',
-        'name': 'v_metadatatext00',
+        'name': 'v_info',
         'type': 'shadow',
         'ncol': 2,
         'wr': 0,
diff --git a/tests/__snapshots__/test-metadata.ambr b/tests/__snapshots__/test-metadata.ambr
index 12212ff0..e5ffaf28 100644
--- a/tests/__snapshots__/test-metadata.ambr
+++ b/tests/__snapshots__/test-metadata.ambr
@@ -28,7 +28,7 @@
           'chunk_id': 1,
           'size': 8,
           'validity': b'\x02',
-          'rowids': b'\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'rowids': b'\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
@@ -89,7 +89,7 @@
       'rows': list([
         OrderedDict({
           'rowid': 1,
-          'vectors': b'\x11\x11\x11\x11""""3333\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'vectors': b'\x00\x00\x00\x00""""\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
@@ -264,7 +264,7 @@
           'chunk_id': 1,
           'size': 8,
           'validity': b'\x06',
-          'rowids': b'\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'rowids': b'\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
@@ -335,7 +335,7 @@
       'rows': list([
         OrderedDict({
           'rowid': 1,
-          'vectors': b'\x11\x11\x11\x11""""3333\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
+          'vectors': b'\x00\x00\x00\x00""""3333\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',
         }),
       ]),
     }),
diff --git a/tests/test-delete-clears-bytes.py b/tests/test-delete-clears-bytes.py
new file mode 100644
index 00000000..41ff37f9
--- /dev/null
+++ b/tests/test-delete-clears-bytes.py
@@ -0,0 +1,106 @@
+import os
+
+
+def test_delete_clears_rowid_and_vectors():
+    try:
+        import pysqlite3 as sqlite3  # uses bundled modern SQLite with extension loading
+    except ImportError:  # fallback if not available
+        import sqlite3
+
+    db = sqlite3.connect(":memory:")
+    db.row_factory = sqlite3.Row
+    if hasattr(db, "enable_load_extension"):
+        db.enable_load_extension(True)
+    ext = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "dist", "vec0"))
+    try:
+        # Explicit entrypoint to avoid relying on default name
+        db.load_extension(ext, "sqlite3_vec_init")
+    except Exception:
+        # Some loaders accept missing suffix path without explicit entrypoint
+        db.load_extension(ext)
+
+    # One vector column with 1 dimension (4 bytes per vector), chunk_size=8
+    db.execute("create virtual table v using vec0(vector float[1], chunk_size=8)")
+
+    # Insert two rows with distinct raw vector bytes
+    db.execute(
+        "insert into v(rowid, vector) values (?, ?)",
+        [1, b"\x11\x11\x11\x11"],
+    )
+    db.execute(
+        "insert into v(rowid, vector) values (?, ?)",
+        [2, b"\x22\x22\x22\x22"],
+    )
+
+    # Sanity check pre-delete: validity has first two bits set (0b00000011)
+    row = db.execute("select validity, rowids from v_chunks").fetchone()
+    assert row is not None
+    assert row[0] == b"\x03"
+
+    # Delete rowid=1
+    db.execute("delete from v where rowid = 1")
+
+    # After delete, validity should only have bit 1 set (0b00000010)
+    row = db.execute("select validity, rowids from v_chunks").fetchone()
+    assert row[0] == b"\x02"
+
+    # Rowids BLOB: first 8 bytes (slot 0) must be zero; second (slot 1) must be rowid=2
+    rowids = row[1]
+    assert isinstance(rowids, (bytes, bytearray))
+    assert len(rowids) == 8 * 8  # chunk_size * sizeof(i64)
+    assert rowids[0:8] == b"\x00" * 8
+    assert rowids[8:16] == b"\x02\x00\x00\x00\x00\x00\x00\x00"
+
+    # Vectors BLOB for the first (and only) vector column
+    vectors_row = db.execute("select vectors from v_vector_chunks00").fetchone()
+    vectors = vectors_row[0]
+    # chunk_size (8) * 4 bytes per float32 = 32 bytes
+    assert len(vectors) == 32
+    # Slot 0 cleared to zeros, slot 1 left as inserted (0x22 0x22 0x22 0x22)
+    assert vectors[0:4] == b"\x00\x00\x00\x00"
+    assert vectors[4:8] == b"\x22\x22\x22\x22"
+
+
+def test_vacuum_shrinks_file(tmp_path):
+    try:
+        import pysqlite3 as sqlite3
+    except ImportError:
+        import sqlite3
+
+    db_path = tmp_path / "vacuum_vec.db"
+
+    con = sqlite3.connect(str(db_path))
+    con.row_factory = sqlite3.Row
+    if hasattr(con, "enable_load_extension"):
+        con.enable_load_extension(True)
+        ext = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "dist", "vec0"))
+        try:
+            con.load_extension(ext)
+        except Exception:
+            # Some platforms require the full filename or default entrypoint; fallback already tried
+            con.load_extension(ext)
+
+    # Use a larger chunk_size to inflate file size more clearly
+    con.execute("create virtual table v using vec0(vector float[1], chunk_size=4096)")
+
+    # Insert a decent number of rows to grow the DB
+    N = 10000
+    con.executemany(
+        "insert into v(rowid, vector) values(?, ?)",
+        ((i, b"\x11\x11\x11\x11") for i in range(1, N + 1)),
+    )
+    con.commit()
+
+    size_after_insert = os.stat(db_path).st_size
+    assert size_after_insert > 0
+
+    # Drop the table to free its pages, then VACUUM to rewrite/shrink the file
+    con.execute("drop table v")
+    con.commit()
+    con.execute("VACUUM")
+    con.close()
+
+    size_after_vacuum = os.stat(db_path).st_size
+
+    # File should shrink after dropping the table and VACUUM
+    assert size_after_vacuum < size_after_insert