feat(database): configure project and start prototyping (#7)

.github/workflows/database-verify.yml

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+name: Database / Verify
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - ".github/workflows/database-*"
+      - "components/api/database/**"
+  pull_request:
+    paths:
+      - ".github/workflows/database-*"
+      - "components/api/database/**"
+  workflow_dispatch:
+
+defaults:
+  run:
+    working-directory: components/api/database/tests
+
+jobs:
+  build:
+    name: "Test and Build"
+    runs-on: ubuntu-latest
+    # Local testing has proved that there are certain errors that can cause
+    # Testcontainers to stall. Make sure the job is aborted after a reasonable
+    # time in such cases!
+    timeout-minutes: 20
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: "21"
+          distribution: "temurin"
+          cache: "gradle"
+
+      - run: ./gradlew :check

components/api/database/.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/linux,windows,macos,intellij,visualstudiocode
+# Edit at https://www.toptal.com/developers/gitignore?templates=linux,windows,macos,intellij,visualstudiocode
+
+### Intellij ###
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+
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+
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+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+# .idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
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+# When using Gradle or Maven with auto-import, you should exclude module files,
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+.idea/compiler.xml
+.idea/jarRepositories.xml
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+.idea/*.iml
+.idea/modules
+*.iml
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+cmake-build-*/
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+.idea/**/mongoSettings.xml
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+*.iws
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+out/
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+atlassian-ide-plugin.xml
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+.idea/sonarlint/
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+
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+.idea/**/sonarlint/
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+.idea/$CACHE_FILE$
+
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+.idea/codestream.xml
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+.fuse_hidden*
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+
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+.history
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