Revert "refactor: use VACUUM INTO for database export"

This reverts commit 27dea3ffab.

.github/workflows/windows-build.yml

@@ -49,6 +49,7 @@ jobs:
             mingw-w64-ucrt-x86_64-qt6-tools
             mingw-w64-ucrt-x86_64-qt6-translations
             mingw-w64-ucrt-x86_64-qt6-pdf
+            mingw-w64-ucrt-x86_64-sqlite3
             mingw-w64-ucrt-x86_64-pkg-config
             mingw-w64-ucrt-x86_64-kwidgetsaddons
             mingw-w64-ucrt-x86_64-kcoreaddons
@@ -121,7 +122,8 @@ jobs:
             -DQET_EXPORT_PROJECT_DB=ON \
             -DCMAKE_C_COMPILER_LAUNCHER=/ucrt64/bin/ccache \
             -DCMAKE_CXX_COMPILER_LAUNCHER=/ucrt64/bin/ccache \
-
+            -DSQLite3_INCLUDE_DIR=/ucrt64/include \
+            -DSQLite3_LIBRARY=/ucrt64/lib/libsqlite3.dll.a \
             ..
           ninja -j"$NPROC"
 
@@ -194,6 +196,13 @@ jobs:
           cp /ucrt64/bin/libgcc_s_seh-1.dll  "$BIN/"
           cp /ucrt64/bin/libstdc++-6.dll      "$BIN/"
           cp /ucrt64/bin/libwinpthread-1.dll  "$BIN/"
+          SQLITE=$(find /ucrt64/bin -name "libsqlite3*.dll" | head -1)
+          if [ -n "$SQLITE" ]; then
+            cp "$SQLITE" "$BIN/"
+            echo "SQLite3 copied: $(basename $SQLITE)"
+          else
+            echo "WARNING: libsqlite3 not found in /ucrt64/bin/"
+          fi
 
           cp "$GITHUB_WORKSPACE/build-aux/windows/QET64.nsi"              "$NSIS_ROOT/"
           cp "$GITHUB_WORKSPACE/build-aux/windows/lang_extra.nsh"         "$NSIS_ROOT/"