diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ed23b90..0fce365 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -18,14 +18,14 @@ on:
     # branches:
     # - ag/release
     tags:
-    - 'v[0-9]+.[0-9]+.[0-9]+*'
+      - "v[0-9]+.[0-9]+.[0-9]+*"
 jobs:
   create-release:
     name: create-release
     runs-on: ubuntu-latest
     # env:
-      # Set to force version number, e.g., when no tag exists.
-      # RG_VERSION: TEST-0.0.0
+    # Set to force version number, e.g., when no tag exists.
+    # RG_VERSION: TEST-0.0.0
     steps:
       - name: Create artifacts directory
         run: mkdir artifacts
@@ -62,7 +62,7 @@ jobs:
 
   build-release:
     name: build-release
-    needs: ['create-release']
+    needs: ["create-release"]
     runs-on: ${{ matrix.os }}
     env:
       # For some builds, we use cross to test on 32-bit and big-endian
@@ -78,124 +78,124 @@ jobs:
       matrix:
         build: [linux, linux-arm, macos, win-msvc]
         include:
-        - build: linux
-          os: ubuntu-18.04
-          rust: nightly
-          target: x86_64-unknown-linux-musl
-        - build: linux-arm
-          os: ubuntu-18.04
-          rust: nightly
-          target: arm-unknown-linux-gnueabihf
-        - build: macos
-          os: macos-latest
-          rust: nightly
-          target: x86_64-apple-darwin
-        - build: win-msvc
-          os: windows-2019
-          rust: nightly
-          target: x86_64-pc-windows-msvc
+          - build: linux
+            os: ubuntu-18.04
+            rust: nightly
+            target: x86_64-unknown-linux-musl
+          - build: linux-arm
+            os: ubuntu-18.04
+            rust: nightly
+            target: arm-unknown-linux-gnueabihf
+          - build: macos
+            os: macos-latest
+            rust: nightly
+            target: x86_64-apple-darwin
+          - build: win-msvc
+            os: windows-2019
+            rust: nightly
+            target: x86_64-pc-windows-msvc
         #- build: win-gnu
         #  os: windows-2019
         #  rust: nightly-x86_64-gnu
         #  target: x86_64-pc-windows-gnu
 
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 1
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
 
-    - name: Install packages (Ubuntu)
-      if: matrix.os == 'ubuntu-18.04'
-      run: |
-        ci/ubuntu-install-packages
+      - name: Install packages (Ubuntu)
+        if: matrix.os == 'ubuntu-18.04'
+        run: |
+          ci/ubuntu-install-packages
 
-    - name: Install packages (macOS)
-      if: matrix.os == 'macos-latest'
-      run: |
-        ci/macos-install-packages
+      - name: Install packages (macOS)
+        if: matrix.os == 'macos-latest'
+        run: |
+          ci/macos-install-packages
 
-    - name: Install Rust
-      uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        profile: minimal
-        override: true
-        target: ${{ matrix.target }}
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          profile: minimal
+          override: true
+          target: ${{ matrix.target }}
 
-    - name: Use Cross
-      # if: matrix.os != 'windows-2019'
-      run: |
-        cargo install cross
-        echo "CARGO=cross" >> $GITHUB_ENV
-        echo "TARGET_FLAGS=--target ${{ matrix.target }}" >> $GITHUB_ENV
-        echo "TARGET_DIR=./target/${{ matrix.target }}" >> $GITHUB_ENV
+      - name: Use Cross
+        shell: bash
+        run: |
+          cargo install cross
+          echo "CARGO=cross" >> $GITHUB_ENV
+          echo "TARGET_FLAGS=--target ${{ matrix.target }}" >> $GITHUB_ENV
+          echo "TARGET_DIR=./target/${{ matrix.target }}" >> $GITHUB_ENV
 
-    - name: Show command used for Cargo
-      run: |
-        echo "cargo command is: ${{ env.CARGO }}"
-        echo "target flag is: ${{ env.TARGET_FLAGS }}"
-        echo "target dir is: ${{ env.TARGET_DIR }}"
+      - name: Show command used for Cargo
+        run: |
+          echo "cargo command is: ${{ env.CARGO }}"
+          echo "target flag is: ${{ env.TARGET_FLAGS }}"
+          echo "target dir is: ${{ env.TARGET_DIR }}"
 
-    - name: Get release download URL
-      uses: actions/download-artifact@v1
-      with:
-        name: artifacts
-        path: artifacts
+      - name: Get release download URL
+        uses: actions/download-artifact@v1
+        with:
+          name: artifacts
+          path: artifacts
 
-    - name: Set release upload URL and release version
-      shell: bash
-      run: |
-        echo "RELEASE_UPLOAD_URL=$(cat artifacts/release-upload-url)" >> $GITHUB_ENV
-        echo "release upload url: $RELEASE_UPLOAD_URL"
-        echo "RELEASE_VERSION=$(cat artifacts/release-version)" >> $GITHUB_ENV
-        echo "release version: $RELEASE_VERSION"
+      - name: Set release upload URL and release version
+        shell: bash
+        run: |
+          echo "RELEASE_UPLOAD_URL=$(cat artifacts/release-upload-url)" >> $GITHUB_ENV
+          echo "release upload url: $RELEASE_UPLOAD_URL"
+          echo "RELEASE_VERSION=$(cat artifacts/release-version)" >> $GITHUB_ENV
+          echo "release version: $RELEASE_VERSION"
 
-    - name: Build release binary
-      run: ${{ env.CARGO }} build --verbose --release ${{ env.TARGET_FLAGS }}
+      - name: Build release binary
+        run: ${{ env.CARGO }} build --verbose --release ${{ env.TARGET_FLAGS }}
 
-    - name: Strip release binary (linux and macos)
-      if: matrix.build == 'linux' || matrix.build == 'macos'
-      run: |
-        strip "target/${{ matrix.target }}/release/rga" "target/${{ matrix.target }}/release/rga-preproc"
+      - name: Strip release binary (linux and macos)
+        if: matrix.build == 'linux' || matrix.build == 'macos'
+        run: |
+          strip "target/${{ matrix.target }}/release/rga" "target/${{ matrix.target }}/release/rga-preproc"
 
-    - name: Strip release binary (arm)
-      if: matrix.build == 'linux-arm'
-      run: |
-        docker run --rm -v \
-          "$PWD/target:/target:Z" \
-          rustembedded/cross:arm-unknown-linux-gnueabihf \
-          arm-linux-gnueabihf-strip \
-          /target/arm-unknown-linux-gnueabihf/release/rga \
-          /target/arm-unknown-linux-gnueabihf/release/rga-preproc
+      - name: Strip release binary (arm)
+        if: matrix.build == 'linux-arm'
+        run: |
+          docker run --rm -v \
+            "$PWD/target:/target:Z" \
+            rustembedded/cross:arm-unknown-linux-gnueabihf \
+            arm-linux-gnueabihf-strip \
+            /target/arm-unknown-linux-gnueabihf/release/rga \
+            /target/arm-unknown-linux-gnueabihf/release/rga-preproc
 
-    - name: Build archive
-      shell: bash
-      run: |
-        staging="ripgrep_all-${{ env.RELEASE_VERSION }}-${{ matrix.target }}"
-        mkdir -p "$staging"/doc
+      - name: Build archive
+        shell: bash
+        run: |
+          staging="ripgrep_all-${{ env.RELEASE_VERSION }}-${{ matrix.target }}"
+          mkdir -p "$staging"/doc
 
-        cp {README.md,LICENSE.md} "$staging/"
-        cp CHANGELOG.md "$staging/doc/"
+          cp {README.md,LICENSE.md} "$staging/"
+          cp CHANGELOG.md "$staging/doc/"
 
-        if [ "${{ matrix.os }}" = "windows-2019" ]; then
-          cp "target/${{ matrix.target }}/release/rga.exe" "$staging/"
-          cp "target/${{ matrix.target }}/release/rga-preproc.exe" "$staging/"
-          7z a "$staging.zip" "$staging"
-          echo "ASSET=$staging.zip" >> $GITHUB_ENV
-        else
-          cp "target/${{ matrix.target }}/release/rga" "$staging/"
-          cp "target/${{ matrix.target }}/release/rga-preproc" "$staging/"
-          tar czf "$staging.tar.gz" "$staging"
-          echo "ASSET=$staging.tar.gz" >> $GITHUB_ENV
-        fi
+          if [ "${{ matrix.os }}" = "windows-2019" ]; then
+            cp "target/${{ matrix.target }}/release/rga.exe" "$staging/"
+            cp "target/${{ matrix.target }}/release/rga-preproc.exe" "$staging/"
+            7z a "$staging.zip" "$staging"
+            echo "ASSET=$staging.zip" >> $GITHUB_ENV
+          else
+            cp "target/${{ matrix.target }}/release/rga" "$staging/"
+            cp "target/${{ matrix.target }}/release/rga-preproc" "$staging/"
+            tar czf "$staging.tar.gz" "$staging"
+            echo "ASSET=$staging.tar.gz" >> $GITHUB_ENV
+          fi
 
-    - name: Upload release archive
-      uses: actions/upload-release-asset@v1.0.1
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ env.RELEASE_UPLOAD_URL }}
-        asset_path: ${{ env.ASSET }}
-        asset_name: ${{ env.ASSET }}
-        asset_content_type: application/octet-stream
+      - name: Upload release archive
+        uses: actions/upload-release-asset@v1.0.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ env.RELEASE_UPLOAD_URL }}
+          asset_path: ${{ env.ASSET }}
+          asset_name: ${{ env.ASSET }}
+          asset_content_type: application/octet-stream
diff --git a/Cargo.lock b/Cargo.lock
index 81cd196..b93e70a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -139,12 +139,6 @@ dependencies = [
  "backtrace",
 ]
 
-[[package]]
-name = "arrayref"
-version = "0.3.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b4930d2cb77ce62f89ee5d5289b4ac049559b1c45539271f5ed4fdc7db34545"
-
 [[package]]
 name = "async-compression"
 version = "0.3.15"
@@ -326,12 +320,6 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c676a478f63e9fa2dd5368a42f28bba0d6c560b775f38583c8bbaa7fcd67c9c"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes"
 version = "1.4.0"
@@ -718,15 +706,6 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
-[[package]]
-name = "form_urlencoded"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
-dependencies = [
- "percent-encoding",
-]
-
 [[package]]
 name = "futures-core"
 version = "0.3.28"
@@ -906,22 +885,6 @@ dependencies = [
  "cc",
 ]
 
-[[package]]
-name = "id-arena"
-version = "2.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25a2bc672d1148e28034f176e01fffebb08b35768468cc954630da77a1449005"
-
-[[package]]
-name = "idna"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
-dependencies = [
- "unicode-bidi",
- "unicode-normalization",
-]
-
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -1024,29 +987,6 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
 
-[[package]]
-name = "lmdb-rkv"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "447a296f7aca299cfbb50f4e4f3d49451549af655fb7215d7f8c0c3d64bad42b"
-dependencies = [
- "bitflags 1.3.2",
- "byteorder",
- "libc",
- "lmdb-rkv-sys",
-]
-
-[[package]]
-name = "lmdb-rkv-sys"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61b9ce6b3be08acefa3003c57b7565377432a89ec24476bbe72e11d101f852fe"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
-]
-
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -1227,15 +1167,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "ordered-float"
-version = "3.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fc2dbde8f8a79f2102cc474ceb0ad68e3b80b85289ea62389b60e66777e4213"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "output_vt100"
 version = "0.1.3"
@@ -1280,12 +1211,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17359afc20d7ab31fdb42bb844c8b3bb1dabd7dcf7e68428492da7f16966fcef"
 
-[[package]]
-name = "percent-encoding"
-version = "2.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
-
 [[package]]
 name = "petgraph"
 version = "0.6.3"
@@ -1477,7 +1402,6 @@ dependencies = [
  "pretty-bytes",
  "pretty_assertions",
  "regex",
- "rkv",
  "rusqlite",
  "schemars",
  "serde",
@@ -1494,29 +1418,6 @@ dependencies = [
  "tree_magic_mini",
 ]
 
-[[package]]
-name = "rkv"
-version = "0.17.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6006704273063c72952370ad236b8d58556dcc4f99a95ced4d9ad40f3e80a69"
-dependencies = [
- "arrayref",
- "bincode",
- "bitflags 1.3.2",
- "byteorder",
- "id-arena",
- "lazy_static",
- "lmdb-rkv",
- "log",
- "ordered-float",
- "paste",
- "serde",
- "serde_derive",
- "thiserror",
- "url",
- "uuid",
-]
-
 [[package]]
 name = "rusqlite"
 version = "0.29.0"
@@ -1808,21 +1709,6 @@ dependencies = [
  "syn 2.0.16",
 ]
 
-[[package]]
-name = "tinyvec"
-version = "1.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
-dependencies = [
- "tinyvec_macros",
-]
-
-[[package]]
-name = "tinyvec_macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
-
 [[package]]
 name = "tokio"
 version = "1.28.1"
@@ -1961,27 +1847,12 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
 
-[[package]]
-name = "unicode-bidi"
-version = "0.3.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
-
 [[package]]
 name = "unicode-ident"
 version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
 
-[[package]]
-name = "unicode-normalization"
-version = "0.1.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
-dependencies = [
- "tinyvec",
-]
-
 [[package]]
 name = "unicode-segmentation"
 version = "1.10.1"
@@ -1994,29 +1865,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
-[[package]]
-name = "url"
-version = "2.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
-dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
-]
-
 [[package]]
 name = "utf8parse"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
-[[package]]
-name = "uuid"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
-
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
diff --git a/Cargo.toml b/Cargo.toml
index 1e37f59..e9d6d24 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,6 @@ paste = "1.0.12"
 path-clean = "1.0.1"
 pretty-bytes = "0.2.2"
 regex = "1.8.2"
-rkv = "0.17" # 0.18 removes lmdb backend
 rusqlite = {version = "0.29.0", features = ["vtab", "bundled"]}
 schemars = {version = "0.8.12", features = ["preserve_order"]}
 serde = {version = "1.0.163", features = ["derive"]}