diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 67e00e06..6743cf2b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,6 +8,13 @@ importers:
       commander: ^5.0.0
       make-promises-safe: ^5.1.0
       spritesmith: ^3.4.0
+  tools/tupctime:
+    dependencies:
+      better-sqlite3: 7.0.1
+      debug: 4.1.1
+    specifiers:
+      better-sqlite3: ^7.0.1
+      debug: ^4.1.1
 lockfileVersion: 5.1
 packages:
   /ajv/6.12.0:
@@ -19,6 +26,23 @@ packages:
     dev: false
     resolution:
       integrity: sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==
+  /ansi-regex/2.1.1:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-w7M6te42DYbg5ijwRorn7yfWVN8=
+  /aproba/1.2.0:
+    dev: false
+    resolution:
+      integrity: sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==
+  /are-we-there-yet/1.1.5:
+    dependencies:
+      delegates: 1.0.0
+      readable-stream: 2.3.7
+    dev: false
+    resolution:
+      integrity: sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==
   /asn1/0.2.4:
     dependencies:
       safer-buffer: 2.1.2
@@ -47,20 +71,58 @@ packages:
     dev: false
     resolution:
       integrity: sha512-wMHVg2EOHaMRxbzgFJ9gtjOOCrI80OHLG14rxi28XwOW8ux6IiEbRCGGGqCtdAIg4FQCbW20k9RsT4y3gJlFug==
+  /base64-js/1.3.1:
+    dev: false
+    resolution:
+      integrity: sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g==
   /bcrypt-pbkdf/1.0.2:
     dependencies:
       tweetnacl: 0.14.5
     dev: false
     resolution:
       integrity: sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=
+  /better-sqlite3/7.0.1:
+    dependencies:
+      bindings: 1.5.0
+      prebuild-install: 5.3.3
+      tar: 4.4.10
+    dev: false
+    requiresBuild: true
+    resolution:
+      integrity: sha512-fsVcoGXxnseNajbfFbth0BKnDWebPY6x77UWfrBHApCKq1yo41DlWnFsffOsLpjkQ4VKgDU5C3aUtiw3wGGU0Q==
   /bin-pack/1.0.2:
     dev: false
     resolution:
       integrity: sha1-wqAU7b8L7XCjKSBi7UZXe5YSBnk=
+  /bindings/1.5.0:
+    dependencies:
+      file-uri-to-path: 1.0.0
+    dev: false
+    resolution:
+      integrity: sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==
+  /bl/4.0.2:
+    dependencies:
+      buffer: 5.6.0
+      inherits: 2.0.4
+      readable-stream: 3.6.0
+    dev: false
+    resolution:
+      integrity: sha512-j4OH8f6Qg2bGuWfRiltT2HYGx0e1QcBTrK9KAHNMwMZdQnDZFk0ZSYIpADjYCB3U12nicC5tVJwSIhwOWjb4RQ==
+  /buffer/5.6.0:
+    dependencies:
+      base64-js: 1.3.1
+      ieee754: 1.1.13
+    dev: false
+    resolution:
+      integrity: sha512-/gDYp/UtU0eA1ys8bOs9J6a+E/KWIY+DZ+Q2WESNUA0jFRsJOc0SNUO6xJ5SGA1xueg3NL65W6s+NY5l9cunuw==
   /caseless/0.12.0:
     dev: false
     resolution:
       integrity: sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
+  /chownr/1.1.4:
+    dev: false
+    resolution:
+      integrity: sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==
   /clone-stats/0.0.1:
     dev: false
     resolution:
@@ -71,6 +133,12 @@ packages:
       node: '>=0.8'
     resolution:
       integrity: sha1-2jCcwmPfFZlMaIypAheco8fNfH4=
+  /code-point-at/1.1.0:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=
   /combined-stream/1.0.8:
     dependencies:
       delayed-stream: 1.0.0
@@ -95,6 +163,10 @@ packages:
       '0': node >= 0.8
     resolution:
       integrity: sha1-cIl4Yk2FavQaWnQd790mHadSwmY=
+  /console-control-strings/1.1.0:
+    dev: false
+    resolution:
+      integrity: sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=
   /contentstream/1.0.0:
     dependencies:
       readable-stream: 1.0.34
@@ -125,12 +197,43 @@ packages:
     dev: false
     resolution:
       integrity: sha1-GK6XmmoMqZSwYlhTkW0mYruuCxo=
+  /debug/4.1.1:
+    dependencies:
+      ms: 2.1.2
+    dev: false
+    resolution:
+      integrity: sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==
+  /decompress-response/4.2.1:
+    dependencies:
+      mimic-response: 2.1.0
+    dev: false
+    engines:
+      node: '>=8'
+    resolution:
+      integrity: sha512-jOSne2qbyE+/r8G1VU+G/82LBs2Fs4LAsTiLSHOCOMZQl2OKZ6i8i4IyHemTe+/yIXOtTcRQMzPcgyhoFlqPkw==
+  /deep-extend/0.6.0:
+    dev: false
+    engines:
+      node: '>=4.0.0'
+    resolution:
+      integrity: sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
   /delayed-stream/1.0.0:
     dev: false
     engines:
       node: '>=0.4.0'
     resolution:
       integrity: sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
+  /delegates/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=
+  /detect-libc/1.0.3:
+    dev: false
+    engines:
+      node: '>=0.10'
+    hasBin: true
+    resolution:
+      integrity: sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
   /ecc-jsbn/0.1.2:
     dependencies:
       jsbn: 0.1.1
@@ -138,6 +241,18 @@ packages:
     dev: false
     resolution:
       integrity: sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=
+  /end-of-stream/1.4.4:
+    dependencies:
+      once: 1.4.0
+    dev: false
+    resolution:
+      integrity: sha512-+uw1inIHVPQoaVuHzRyXd21icM+cnt4CzD5rW+NC1wjOUSTOs+Te7FOv7AhN7vS9x/oIyhLP5PR1H+phQAHu5Q==
+  /expand-template/2.0.3:
+    dev: false
+    engines:
+      node: '>=6'
+    resolution:
+      integrity: sha512-XYfuKMvj4O35f/pOXLObndIRvyQ+/+6AhODh+OKWj9S9498pHHn/IMszH+gt0fBCRWMNfk1ZSp5x3AifmnI2vg==
   /extend/3.0.2:
     dev: false
     resolution:
@@ -156,6 +271,10 @@ packages:
     dev: false
     resolution:
       integrity: sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==
+  /file-uri-to-path/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==
   /first-chunk-stream/1.0.0:
     dev: false
     engines:
@@ -176,6 +295,29 @@ packages:
       node: '>= 0.12'
     resolution:
       integrity: sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==
+  /fs-constants/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow==
+  /fs-minipass/1.2.7:
+    dependencies:
+      minipass: 2.9.0
+    dev: false
+    resolution:
+      integrity: sha512-GWSSJGFy4e9GUeCcbIkED+bgAoFyj7XF1mV8rma3QW4NIqX9Kyx79N/PF61H5udOV3aY1IaMLs6pGbH71nlCTA==
+  /gauge/2.7.4:
+    dependencies:
+      aproba: 1.2.0
+      console-control-strings: 1.1.0
+      has-unicode: 2.0.1
+      object-assign: 4.1.1
+      signal-exit: 3.0.3
+      string-width: 1.0.2
+      strip-ansi: 3.0.1
+      wide-align: 1.1.3
+    dev: false
+    resolution:
+      integrity: sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=
   /get-pixels/3.3.2:
     dependencies:
       data-uri-to-buffer: 0.0.3
@@ -206,6 +348,10 @@ packages:
       node: '>= 0.8.0'
     resolution:
       integrity: sha1-iitP6MqJWkjjoLbLs0CgpqNXGJk=
+  /github-from-package/0.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-l/tdlr/eiXMxPyDoKI75oWf6ZM4=
   /graceful-fs/4.2.3:
     dev: false
     resolution:
@@ -225,6 +371,10 @@ packages:
       node: '>=6'
     resolution:
       integrity: sha512-sNvOCzEQNr/qrvJgc3UG/kD4QtlHycrzwS+6mfTrrSq97BvaYcPZZI1ZSqGSPR73Cxn4LKTD4PttRwfU7jWq5g==
+  /has-unicode/2.0.1:
+    dev: false
+    resolution:
+      integrity: sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=
   /http-signature/1.2.0:
     dependencies:
       assert-plus: 1.0.0
@@ -236,10 +386,18 @@ packages:
       npm: '>=1.3.7'
     resolution:
       integrity: sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=
+  /ieee754/1.1.13:
+    dev: false
+    resolution:
+      integrity: sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg==
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+  /ini/1.3.5:
+    dev: false
+    resolution:
+      integrity: sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
   /iota-array/1.0.0:
     dev: false
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     dev: false
     resolution:
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+  /is-fullwidth-code-point/1.0.0:
+    dependencies:
+      number-is-nan: 1.0.1
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
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   /is-typedarray/1.0.0:
     dev: false
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+  /mimic-response/2.1.0:
+    dev: false
+    engines:
+      node: '>=8'
+    resolution:
+      integrity: sha512-wXqjST+SLt7R009ySCglWBCFpjUygmCIfD790/kVbiGmUgfYGuB14PiTd5DwVxSV4NcYHjzMkoj5LjQZwTQLEA==
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+    dev: false
+    resolution:
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+  /minipass/2.9.0:
+    dependencies:
+      safe-buffer: 5.2.0
+      yallist: 3.1.1
+    dev: false
+    resolution:
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+  /minizlib/1.3.3:
+    dependencies:
+      minipass: 2.9.0
+    dev: false
+    resolution:
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+    dev: false
+    resolution:
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+  /mkdirp/0.5.5:
+    dependencies:
+      minimist: 1.2.5
+    dev: false
+    hasBin: true
+    resolution:
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+    dev: false
+    resolution:
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+  /napi-build-utils/1.0.2:
+    dev: false
+    resolution:
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+  /node-abi/2.16.0:
+    dependencies:
+      semver: 5.7.1
+    dev: false
+    resolution:
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     dev: false
     engines:
       node: '>=v0.6.5'
     resolution:
       integrity: sha1-GA6scAPgxwdhjvMTaPYvhLKmkJE=
+  /noop-logger/0.1.1:
+    dev: false
+    resolution:
+      integrity: sha1-lKKxYzxPExdVMAfYlm/Q6EG2pMI=
+  /npmlog/4.1.2:
+    dependencies:
+      are-we-there-yet: 1.1.5
+      console-control-strings: 1.1.0
+      gauge: 2.7.4
+      set-blocking: 2.0.0
+    dev: false
+    resolution:
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+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
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   /oauth-sign/0.9.0:
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     resolution:
@@ -363,10 +596,22 @@ packages:
     dev: false
     resolution:
       integrity: sha1-u0SKR3X7les0p4H5CLusLfI9u1s=
+  /object-assign/4.1.1:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
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+    dependencies:
+      wrappy: 1.0.2
+    dev: false
+    resolution:
+      integrity: sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
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     dependencies:
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+  /prebuild-install/5.3.3:
+    dependencies:
+      detect-libc: 1.0.3
+      expand-template: 2.0.3
+      github-from-package: 0.0.0
+      minimist: 1.2.5
+      mkdirp: 0.5.5
+      napi-build-utils: 1.0.2
+      node-abi: 2.16.0
+      noop-logger: 0.1.1
+      npmlog: 4.1.2
+      pump: 3.0.0
+      rc: 1.2.8
+      simple-get: 3.1.0
+      tar-fs: 2.0.1
+      tunnel-agent: 0.6.0
+      which-pm-runs: 1.0.0
+    dev: false
+    engines:
+      node: '>=6'
+    hasBin: true
+    resolution:
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+    dependencies:
+      end-of-stream: 1.4.4
+      once: 1.4.0
+    dev: false
+    resolution:
+      integrity: sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==
   /punycode/2.1.1:
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+  /rc/1.2.8:
+    dependencies:
+      deep-extend: 0.6.0
+      ini: 1.3.5
+      minimist: 1.2.5
+      strip-json-comments: 2.0.1
+    dev: false
+    hasBin: true
+    resolution:
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   /readable-stream/1.0.34:
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+  /readable-stream/3.6.0:
+    dependencies:
+      inherits: 2.0.4
+      string_decoder: 1.3.0
+      util-deprecate: 1.0.2
+    dev: false
+    engines:
+      node: '>= 6'
+    resolution:
+      integrity: sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
   /replace-ext/0.0.1:
     dev: false
     engines:
@@ -533,6 +828,31 @@ packages:
     hasBin: true
     resolution:
       integrity: sha1-d0Zt5YnNXTyV8TiqeLxWmjy10no=
+  /semver/5.7.1:
+    dev: false
+    hasBin: true
+    resolution:
+      integrity: sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
+  /set-blocking/2.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-BF+XgtARrppoA93TgrJDkrPYkPc=
+  /signal-exit/3.0.3:
+    dev: false
+    resolution:
+      integrity: sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==
+  /simple-concat/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY=
+  /simple-get/3.1.0:
+    dependencies:
+      decompress-response: 4.2.1
+      once: 1.4.0
+      simple-concat: 1.0.0
+    dev: false
+    resolution:
+      integrity: sha512-bCR6cP+aTdScaQCnQKbPKtJOKDp/hj9EDLJo3Nw4y1QksqaovlW/bnptB6/c1e+qmNIDHRK+oXFDdEqBT8WzUA==
   /spritesmith/3.4.0:
     dependencies:
       concat-stream: 1.5.2
@@ -562,6 +882,16 @@ packages:
     hasBin: true
     resolution:
       integrity: sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==
+  /string-width/1.0.2:
+    dependencies:
+      code-point-at: 1.1.0
+      is-fullwidth-code-point: 1.0.0
+      strip-ansi: 3.0.1
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=
   /string_decoder/0.10.31:
     dev: false
     resolution:
@@ -572,6 +902,20 @@ packages:
     dev: false
     resolution:
       integrity: sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==
+  /string_decoder/1.3.0:
+    dependencies:
+      safe-buffer: 5.2.0
+    dev: false
+    resolution:
+      integrity: sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==
+  /strip-ansi/3.0.1:
+    dependencies:
+      ansi-regex: 2.1.1
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=
   /strip-bom-stream/1.0.0:
     dependencies:
       first-chunk-stream: 1.0.0
@@ -589,6 +933,45 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=
+  /strip-json-comments/2.0.1:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-PFMZQukIwml8DsNEhYwobHygpgo=
+  /tar-fs/2.0.1:
+    dependencies:
+      chownr: 1.1.4
+      mkdirp-classic: 0.5.2
+      pump: 3.0.0
+      tar-stream: 2.1.2
+    dev: false
+    resolution:
+      integrity: sha512-6tzWDMeroL87uF/+lin46k+Q+46rAJ0SyPGz7OW7wTgblI273hsBqk2C1j0/xNadNLKDTUL9BukSjB7cwgmlPA==
+  /tar-stream/2.1.2:
+    dependencies:
+      bl: 4.0.2
+      end-of-stream: 1.4.4
+      fs-constants: 1.0.0
+      inherits: 2.0.4
+      readable-stream: 3.6.0
+    dev: false
+    resolution:
+      integrity: sha512-UaF6FoJ32WqALZGOIAApXx+OdxhekNMChu6axLJR85zMMjXKWFGjbIRe+J6P4UnRGg9rAwWvbTT0oI7hD/Un7Q==
+  /tar/4.4.10:
+    dependencies:
+      chownr: 1.1.4
+      fs-minipass: 1.2.7
+      minipass: 2.9.0
+      minizlib: 1.3.3
+      mkdirp: 0.5.5
+      safe-buffer: 5.2.0
+      yallist: 3.1.1
+    dev: false
+    engines:
+      node: '>=4.5'
+    resolution:
+      integrity: sha512-g2SVs5QIxvo6OLp0GudTqEf05maawKUxXru104iaayWA09551tFCTI8f1Asb4lPfkBr91k07iL4c11XO3/b0tA==
   /through/2.3.8:
     dev: false
     resolution:
@@ -673,9 +1056,27 @@ packages:
       node: '>= 0.9'
     resolution:
       integrity: sha1-XIgDbPVl5d8FVYv8kR+GVt8hiIQ=
+  /which-pm-runs/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=
+  /wide-align/1.1.3:
+    dependencies:
+      string-width: 1.0.2
+    dev: false
+    resolution:
+      integrity: sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==
+  /wrappy/1.0.2:
+    dev: false
+    resolution:
+      integrity: sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
   /xtend/4.0.2:
     dev: false
     engines:
       node: '>=0.4'
     resolution:
       integrity: sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
+  /yallist/3.1.1:
+    dev: false
+    resolution:
+      integrity: sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index a67fab0f..5d34a696 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -1,2 +1,3 @@
 packages:
     - 'tools/sprites'
+    - 'tools/tupctime'
diff --git a/tools/tupctime/index.js b/tools/tupctime/index.js
new file mode 100644
index 00000000..bb29ee2c
--- /dev/null
+++ b/tools/tupctime/index.js
@@ -0,0 +1,70 @@
+
+const fs = require('fs');
+const pathlib = require('path');
+const Database = require('better-sqlite3');
+const debug = require('debug')('tupctime');
+
+const start = process.argv[2];
+if (start === undefined) {
+    throw new Error("Pass in directory containing tup db.");
+}
+
+process.chdir(start);
+
+while (true) {
+    if (fs.existsSync('.tup')) {
+        break;
+    }
+
+    if (process.cwd() === '/') {
+        throw new Error("Can't find tup root.");
+    }
+
+    process.chdir('..');
+}
+
+const db = new Database('.tup/db');
+
+const TUP_DB_FILE = 0;
+const TUP_DB_DIR = 2;
+const TUP_DB_GENERATED = 4;
+const TUP_DB_GENERATED_DIR = 7;
+
+// ^ and $ are virtual directories for environment variables
+const traversalQuery = db.prepare(`
+SELECT id, type, mtime as ctime, name 
+FROM node 
+WHERE dir = ? 
+AND type IN (${TUP_DB_FILE}, ${TUP_DB_DIR}, ${TUP_DB_GENERATED}, ${TUP_DB_GENERATED_DIR})
+AND name NOT IN ('^', '$')`);
+const updateQuery = db.prepare(`UPDATE node SET mtime = ? WHERE id = ?`);
+
+function update() {
+    const stack = [{isDir: true, id: 0, path: "."}];
+
+    let item;
+    while (item = stack.pop()) {
+        if (!fs.existsSync(item.path)) {
+            debug(`Ignoring ${item.path}`);
+            continue;
+        }
+        
+        if (item.isDir) {
+            for (const {id, type, ctime, name} of traversalQuery.iterate(item.id)) {
+                const isDir = [TUP_DB_DIR, TUP_DB_GENERATED_DIR].includes(type);
+                const path = pathlib.join(item.path, name);
+                stack.push({isDir, id, ctime: BigInt(ctime), path});
+            }
+        } else {
+            // bigint calculation is necessary to avoid rounding errors/spurious update
+            const ctime = fs.lstatSync(item.path, {bigint: true}).ctimeMs / 1000n;
+            if (ctime !== item.ctime) {
+                debug(`Updating ${item.path}: ${ctime}, ${item.ctime}`);
+                if (updateQuery.run(ctime, item.id).changes !== 1)
+                    throw new Error(`Couldn't update ${path}`);
+            }
+        }
+    }
+}
+
+db.transaction(update)();
diff --git a/tools/tupctime/package.json b/tools/tupctime/package.json
new file mode 100644
index 00000000..2cf0c9d8
--- /dev/null
+++ b/tools/tupctime/package.json
@@ -0,0 +1 @@
+{"dependencies":{"better-sqlite3":"^7.0.1","debug":"^4.1.1"}}