diff --git a/.github/workflows/ci-expanded.yml b/.github/workflows/ci-expanded.yml
index 54ee11560..a5a5f820a 100644
--- a/.github/workflows/ci-expanded.yml
+++ b/.github/workflows/ci-expanded.yml
@@ -7,7 +7,8 @@
 
 name: Expanded Continuous Integration
 
-on: [ workflow_dispatch ]
+on:
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.repository_owner == 'libbitcoin' && (github.event.pull_request.number || github.run_id) || github.ref }}
@@ -34,6 +35,8 @@ jobs:
 
 
   gnu:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -422,6 +425,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -430,13 +434,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -542,6 +556,8 @@ jobs:
           if-no-files-found: warn
 
   cmake:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -930,6 +946,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -938,13 +955,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -1050,6 +1077,8 @@ jobs:
           if-no-files-found: warn
 
   presets:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -1366,6 +1395,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -1374,13 +1404,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -1481,6 +1521,8 @@ jobs:
           if-no-files-found: warn
 
   msvc:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -1529,6 +1571,7 @@ jobs:
           msbuild-architecture: x64
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -1537,7 +1580,15 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: powershell
+        run: |
+          Remove-Item -Path ${{ github.workspace }}\libbitcoin-system -Recurse -Force -ErrorAction SilentlyContinue
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 108a7839b..6d5c1785c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,11 @@
 
 name: Continuous Integration
 
-on: [ pull_request, push, workflow_dispatch ]
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, closed]
+  push:
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.repository_owner == 'libbitcoin' && (github.event.pull_request.number || github.run_id) || github.ref }}
@@ -34,6 +38,8 @@ jobs:
 
 
   gnu:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -115,6 +121,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -123,13 +130,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -235,6 +252,8 @@ jobs:
           if-no-files-found: warn
 
   cmake:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -316,6 +335,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -324,13 +344,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -436,6 +466,8 @@ jobs:
           if-no-files-found: warn
 
   presets:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -480,6 +512,7 @@ jobs:
           fi
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -488,13 +521,23 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: bash
+        run: |
+          rm -rf ${{ github.workspace }}/libbitcoin-system
+
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           path: 'libbitcoin-database'
           repository: ${{ github.repository }}
 
+
       - name: Prepare toolchain [linux]
         if: ${{ startsWith(matrix.image, 'ubuntu') }}
         shell: bash
@@ -595,6 +638,8 @@ jobs:
           if-no-files-found: warn
 
   msvc:
+    if: github.event_name != 'pull_request' || github.event.action != 'closed'
+
     strategy:
       fail-fast: false
 
@@ -631,6 +676,7 @@ jobs:
           msbuild-architecture: x64
 
       - name: Checkout repository [libbitcoin-system]
+        id: checkout-libbitcoin-system
         continue-on-error: true
         uses: actions/checkout@v6
         with:
@@ -639,7 +685,15 @@ jobs:
           ref: ${{ steps.get-branch.outputs.branch }}
           repository: ${{ github.repository_owner }}/libbitcoin-system
 
+      - name: Checkout repository [libbitcoin-system] cleanup on failure
+        continue-on-error: true
+        if: steps.checkout-libbitcoin-system.outcome == 'failure'
+        shell: powershell
+        run: |
+          Remove-Item -Path ${{ github.workspace }}\libbitcoin-system -Recurse -Force -ErrorAction SilentlyContinue
+
       - name: Checkout repository [libbitcoin-database]
+        id: checkout-libbitcoin-database
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
diff --git a/.gitignore b/.gitignore
index 2b1f770f1..2427ca2ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,11 @@
 # python bytecode
 *.pyc
 
+# store
+*.bin
+*.head
+*.data
+
 # gnu
 .deps
 Makefile