diff --git a/nodejs-assets/nodejs-project/main.js b/nodejs-assets/nodejs-project/main.js
index 3e7f315..ffcc691 100644
--- a/nodejs-assets/nodejs-project/main.js
+++ b/nodejs-assets/nodejs-project/main.js
@@ -1,7 +1,36 @@
 'use strict';
 
+const fs = require('fs');
 const path = require('path');
 
+// better-sqlite3's better_sqlite3.node is architecture-specific (it links
+// against libnode.so, which is the real Android binary already loaded into
+// this process by nodejs-mobile-cordova). The copy under node_modules/ is
+// whichever architecture it happened to be built for last; replace it with
+// the prebuild matching this device's actual arch before anything requires
+// better-sqlite3. See scripts/build-better-sqlite3-arm.sh.
+(function installBetterSqlite3Prebuild() {
+  const archDirs = {
+    arm64: 'arm64-v8a',
+    arm: 'armeabi-v7a',
+    x64: 'x86_64',
+    ia32: 'x86',
+  };
+  const archDir = archDirs[process.arch];
+  if (!archDir) return; // Unknown arch — fall back to whatever's bundled.
+
+  const prebuilt = path.join(__dirname, 'prebuilds', archDir, 'better_sqlite3.node');
+  const target = path.join(__dirname, 'node_modules', 'better-sqlite3', 'build', 'Release', 'better_sqlite3.node');
+  if (!fs.existsSync(prebuilt)) return;
+
+  try {
+    fs.mkdirSync(path.dirname(target), { recursive: true });
+    fs.copyFileSync(prebuilt, target);
+  } catch (err) {
+    console.error('[main.js] Failed to install better-sqlite3 prebuild for', process.arch, err);
+  }
+})();
+
 // Node 12.19 predates crypto.randomUUID (added in Node 14.17), used by
 // services/authService.js for session token IDs.
 const nodeCrypto = require('crypto');
diff --git a/nodejs-assets/nodejs-project/prebuilds/arm64-v8a/better_sqlite3.node b/nodejs-assets/nodejs-project/prebuilds/arm64-v8a/better_sqlite3.node
new file mode 100755
index 0000000..b4bb34a
Binary files /dev/null and b/nodejs-assets/nodejs-project/prebuilds/arm64-v8a/better_sqlite3.node differ
diff --git a/nodejs-assets/nodejs-project/prebuilds/armeabi-v7a/better_sqlite3.node b/nodejs-assets/nodejs-project/prebuilds/armeabi-v7a/better_sqlite3.node
new file mode 100755
index 0000000..015367f
Binary files /dev/null and b/nodejs-assets/nodejs-project/prebuilds/armeabi-v7a/better_sqlite3.node differ
diff --git a/nodejs-assets/nodejs-project/prebuilds/x86_64/better_sqlite3.node b/nodejs-assets/nodejs-project/prebuilds/x86_64/better_sqlite3.node
new file mode 100755
index 0000000..ea4404c
Binary files /dev/null and b/nodejs-assets/nodejs-project/prebuilds/x86_64/better_sqlite3.node differ
diff --git a/scripts/build-better-sqlite3-arm.sh b/scripts/build-better-sqlite3-arm.sh
new file mode 100755
index 0000000..670d73d
--- /dev/null
+++ b/scripts/build-better-sqlite3-arm.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+# Cross-compiles better-sqlite3 for arm64-v8a and armeabi-v7a (real Android
+# devices) and writes the resulting better_sqlite3.node binaries into
+# nodejs-assets/nodejs-project/prebuilds/<abi>/. main.js installs the one
+# matching the device's actual process.arch at runtime — see main.js's
+# installBetterSqlite3Prebuild().
+#
+# The existing x86_64 build (emulator) in
+# nodejs-assets/nodejs-project/node_modules/better-sqlite3/build/Release/
+# already covers nodejs-assets/nodejs-project/prebuilds/x86_64/ via
+# fix-better-sqlite3-android.sh; re-copy it manually if that build changes:
+#   cp nodejs-assets/nodejs-project/node_modules/better-sqlite3/build/Release/better_sqlite3.node \
+#      nodejs-assets/nodejs-project/prebuilds/x86_64/
+#
+# Requires: Android NDK (ANDROID_HOME or ANDROID_NDK_HOME set), and
+# `npm install` already run in nodejs-assets/nodejs-project (so
+# better-sqlite3's source + nodejs-mobile-gyp are present).
+#
+# Usage: ./scripts/build-better-sqlite3-arm.sh
+
+set -euo pipefail
+
+MOBILE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PKG_SRC="$MOBILE_DIR/nodejs-assets/nodejs-project/node_modules/better-sqlite3"
+PREBUILDS_DIR="$MOBILE_DIR/nodejs-assets/nodejs-project/prebuilds"
+GYP="$MOBILE_DIR/nodejs-assets/nodejs-project/node_modules/.bin/nodejs-mobile-gyp"
+NODEDIR="$MOBILE_DIR/node_modules/nodejs-mobile-cordova/libs/android/libnode"
+
+NDK="${ANDROID_NDK_HOME:-${ANDROID_NDK_ROOT:-}}"
+if [[ -z "$NDK" ]]; then
+  SDK="${ANDROID_HOME:-${ANDROID_SDK_ROOT:-}}"
+  [[ -n "$SDK" ]] && NDK="$(ls -d "$SDK"/ndk/*/ 2>/dev/null | sort -V | tail -1)"
+fi
+NDK="${NDK%/}"
+
+if [[ ! -d "$PKG_SRC" ]]; then
+  echo "Error: $PKG_SRC not found. Run npm install in nodejs-assets/nodejs-project first." >&2
+  exit 1
+fi
+if [[ -z "$NDK" || ! -d "$NDK" ]]; then
+  echo "Error: Android NDK not found. Set ANDROID_NDK_HOME (or ANDROID_HOME with an ndk/ subdir)." >&2
+  exit 1
+fi
+if [[ ! -x "$GYP" ]]; then
+  echo "Error: $GYP not found. Run npm install in nodejs-assets/nodejs-project first." >&2
+  exit 1
+fi
+
+TOOLCHAIN="$NDK/toolchains/llvm/prebuilt/linux-x86_64"
+API=24 # matches android/variables.gradle minSdkVersion
+
+# Each ABI's libnode.so ships gzipped; better-sqlite3's binding.gyp (via
+# nodejs-mobile's common.gypi) needs the real .so to add it as a NEEDED entry.
+for abi in arm64-v8a armeabi-v7a; do
+  LIBNODE_DIR="$NODEDIR/bin/$abi"
+  if [[ ! -f "$LIBNODE_DIR/libnode.so" && -f "$LIBNODE_DIR/libnode.so.gz" ]]; then
+    gunzip -k "$LIBNODE_DIR/libnode.so.gz"
+  fi
+done
+
+build_one() {
+  local abi="$1" gyp_arch="$2" cc="$3" cxx="$4"
+  local build_dir="$MOBILE_DIR/build-output/better-sqlite3-$abi"
+
+  echo "── Building better-sqlite3 for $abi ($gyp_arch) ──"
+  rm -rf "$build_dir"
+  mkdir -p "$build_dir"
+  rsync -a --exclude=build --exclude=prebuilds "$PKG_SRC/" "$build_dir/"
+
+  # v8::Object::CreationContext() was removed in newer V8; nodejs-mobile's
+  # bundled V8 (Node 12.19) only has the old non-checked accessor. Same patch
+  # as fix-better-sqlite3-android.sh.
+  sed -i 's/obj->GetCreationContext().ToLocalChecked()/obj->CreationContext()/' \
+    "$build_dir/src/util/binder.cpp"
+
+  (
+    cd "$build_dir"
+    CC="$TOOLCHAIN/bin/$cc" \
+    CXX="$TOOLCHAIN/bin/$cxx" \
+    AR="$TOOLCHAIN/bin/llvm-ar" \
+    GYP_DEFINES="OS=android" \
+    "$GYP" configure --target=12.19.0 --arch="$gyp_arch" --nodedir="$NODEDIR"
+
+    CC="$TOOLCHAIN/bin/$cc" \
+    CXX="$TOOLCHAIN/bin/$cxx" \
+    AR="$TOOLCHAIN/bin/llvm-ar" \
+    "$GYP" build
+  )
+
+  mkdir -p "$PREBUILDS_DIR/$abi"
+  cp "$build_dir/build/Release/better_sqlite3.node" "$PREBUILDS_DIR/$abi/better_sqlite3.node"
+  echo "Wrote $PREBUILDS_DIR/$abi/better_sqlite3.node"
+}
+
+build_one arm64-v8a   arm64 aarch64-linux-android${API}-clang   aarch64-linux-android${API}-clang++
+build_one armeabi-v7a arm   armv7a-linux-androideabi${API}-clang armv7a-linux-androideabi${API}-clang++
+
+echo "Done. Verify with: file $PREBUILDS_DIR/*/better_sqlite3.node"
diff --git a/scripts/fix-better-sqlite3-android.sh b/scripts/fix-better-sqlite3-android.sh
index 3e5754e..2d184fa 100755
--- a/scripts/fix-better-sqlite3-android.sh
+++ b/scripts/fix-better-sqlite3-android.sh
@@ -52,4 +52,11 @@ cd "$PKG_DIR/build"
 rm -f Release/better_sqlite3.node Release/obj.target/better_sqlite3.node
 make BUILDTYPE=Release better_sqlite3.node
 
+# Keep the x86_64 prebuild (emulator) in sync — main.js picks the right one
+# for the device's process.arch at runtime. arm64-v8a/armeabi-v7a prebuilds
+# are produced separately by build-better-sqlite3-arm.sh.
+PREBUILD_DIR="$MOBILE_DIR/nodejs-assets/nodejs-project/prebuilds/x86_64"
+mkdir -p "$PREBUILD_DIR"
+cp "$PKG_DIR/build/Release/better_sqlite3.node" "$PREBUILD_DIR/better_sqlite3.node"
+
 echo "Done. Verify with: readelf -d \"$PKG_DIR/build/Release/better_sqlite3.node\" | grep libnode"