diff --git a/.github/workflows/diagram.yml b/.github/workflows/diagram.yml
new file mode 100644
index 00000000..9871979a
--- /dev/null
+++ b/.github/workflows/diagram.yml
@@ -0,0 +1,27 @@
+name: Render Mermaid Diagrams
+on:
+  push:
+    paths:
+      - 'docs/*.mmd' # Trigger only when mermaid files change
+
+jobs:
+  render:
+    runs-on: ubuntu-latest
+    # Grant the action permission to write to the repository
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Mermaid CLI
+        run: npm install -g @mermaid-js/mermaid-cli
+
+      - name: Render Diagram
+        run: mmdc -p docs/puppeteer-config.json -i docs/architecture.mmd -o docs/images/architecture.svg -t neutral
+
+      - name: Commit and Push
+        uses: stefanzweifel/git-auto-commit-action@v7
+        with:
+          commit_message: "docs: update rendered mermaid diagram [skip ci]"
+          file_pattern: 'docs/images/*.svg'
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fb022d87..b5638516 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -19,6 +19,7 @@ repos:
       - id: mixed-line-ending
       - id: check-yaml
       - id: pretty-format-json
+        args: [--autofix]
       - id: detect-private-key
       - id: debug-statements
 
diff --git a/docs/architecture.mmd b/docs/architecture.mmd
new file mode 100644
index 00000000..50c9d61a
--- /dev/null
+++ b/docs/architecture.mmd
@@ -0,0 +1,19 @@
+sequenceDiagram
+    autonumber
+    participant Pytest as Pytest runner
+    participant ProcFactory as postgresql_proc_factory
+    participant PgServer as PostgreSQL process
+    participant TemplateDB as Template DB (seeded)
+    participant TestDB as Per-test DB (clone)
+
+    Pytest->>ProcFactory: request postgresql_proc with load=[load_database]
+    ProcFactory->>PgServer: start server
+    ProcFactory->>TemplateDB: invoke load_database (create metadata, seed data)
+    Note right of TemplateDB: Template is created and seeded once per full run
+    loop per test
+        Pytest->>PgServer: request clone of TemplateDB
+        PgServer->>TestDB: create cloned database for test
+        Pytest->>TestDB: run test using cloned DB
+        Pytest->>TestDB: teardown: commit transaction
+        Pytest->>TestDB: teardown: drop_all metadata (cleanup)
+    end
diff --git a/docs/images/.keep b/docs/images/.keep
new file mode 100644
index 00000000..e69de29b
diff --git a/docs/images/architecture.svg b/docs/images/architecture.svg
new file mode 100644
index 00000000..31c3732b
--- /dev/null
+++ b/docs/images/architecture.svg
@@ -0,0 +1 @@
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id="sequencenumber" refX="15" refY="15" markerWidth="60" markerHeight="40" orient="auto"><circle cx="15" cy="15" r="6"/></marker></defs><g><rect x="917" y="211" fill="#EDF2AE" stroke="#666" width="329" height="37" class="note"/><text x="1082" y="216" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="noteText" dy="1em" style="font-size: 16px; font-weight: 400;"><tspan x="1082">Template is created and seeded once per full run</tspan></text></g><g><line x1="64" y1="258" x2="1282" y2="258" class="loopLine"/><line x1="1282" y1="258" x2="1282" y2="529" class="loopLine"/><line x1="64" y1="529" x2="1282" y2="529" class="loopLine"/><line x1="64" y1="258" x2="64" y2="529" class="loopLine"/><polygon points="64,258 114,258 114,271 105.6,278 64,278" class="labelBox"/><text x="89" y="271" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="labelText" style="font-size: 16px; font-weight: 400;">loop</text><text x="698" y="276" text-anchor="middle" class="loopText" style="font-size: 16px; font-weight: 400;"><tspan x="698">[per test]</tspan></text></g><text x="272" y="80" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">request postgresql_proc with load=[load_database]</text><line x1="76" y1="111" x2="468" y2="111" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="76" y1="111" x2="76" y2="111" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="76" y="115" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">1</text><text x="577" y="126" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">start server</text><line x1="473" y1="155" x2="681" y2="155" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="473" y1="155" x2="473" y2="155" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="473" y="159" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">2</text><text x="681" y="170" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">invoke load_database (create metadata, seed data)</text><line x1="473" y1="201" x2="888" y2="201" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="473" y1="201" x2="473" y2="201" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="473" y="205" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">3</text><text x="379" y="308" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">request clone of TemplateDB</text><line x1="76" y1="339" x2="681" y2="339" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="76" y1="339" x2="76" y2="339" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="76" y="343" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">4</text><text x="977" y="354" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">create cloned database for test</text><line x1="686" y1="383" x2="1267" y2="383" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="686" y1="383" x2="686" y2="383" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="686" y="387" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">5</text><text x="672" y="398" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">run test using cloned DB</text><line x1="76" y1="429" x2="1267" y2="429" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="76" y1="429" x2="76" y2="429" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="76" y="433" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">6</text><text x="672" y="444" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">teardown: commit transaction</text><line x1="76" y1="473" x2="1267" y2="473" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="76" y1="473" x2="76" y2="473" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="76" y="477" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">7</text><text x="672" y="488" text-anchor="middle" dominant-baseline="middle" alignment-baseline="middle" class="messageText" dy="1em" style="font-size: 16px; font-weight: 400;">teardown: drop_all metadata (cleanup)</text><line x1="76" y1="519" x2="1267" y2="519" class="messageLine0" stroke-width="2" stroke="none" marker-end="url(#arrowhead)" style="fill: none;"/><line x1="76" y1="519" x2="76" y2="519" stroke-width="0" marker-start="url(#sequencenumber)"/><text x="76" y="523" font-family="sans-serif" font-size="12px" text-anchor="middle" class="sequenceNumber">8</text></svg>
diff --git a/docs/puppeteer-config.json b/docs/puppeteer-config.json
new file mode 100644
index 00000000..625abff7
--- /dev/null
+++ b/docs/puppeteer-config.json
@@ -0,0 +1,6 @@
+{
+  "args": [
+    "--no-sandbox",
+    "--disable-setuid-sandbox"
+  ]
+}
diff --git a/newsfragments/1244.docs.rst b/newsfragments/1244.docs.rst
new file mode 100644
index 00000000..38554dfb
--- /dev/null
+++ b/newsfragments/1244.docs.rst
@@ -0,0 +1 @@
+Add plugins' architecture diagram.