feat: add database for moderation

[wiktoriavh]

erDiagram
    User {
        int userId PK
        string discordUserId UK
        Role role
    }

    Action {
        int actionId PK
        int userId FK
        ActionType type
        ActionStatus status
        int moderatorUserId FK
        ActionReason reason
        string note
        int createdAt
        int expiresAt
        int revertingActionId FK
    }

    User ||--o{ Action : "receives actions"
    User ||--o{ Action : "moderates"
    Action ||--o| Action : "reverts"

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Pull Request Overview

This PR adds a database layer for moderation functionality using Prisma with SQLite. The implementation introduces a schema for tracking users, moderation actions, and their relationships, along with Docker configuration updates to support database migrations and persistence.

Key Changes:

• Adds Prisma schema with User and Action models to track moderation events
• Implements graceful shutdown handlers in the application entry point
• Configures Docker volumes and migration service for database persistence

Reviewed Changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/index.ts	Adds SIGINT/SIGTERM handlers for graceful shutdown
prisma/schema.prisma	Defines database schema with User and Action models, enums for roles, action types, and statuses
prisma.config.ts	Configures Prisma with schema path, migrations, and datasource
package.json	Adds Prisma dependencies (@prisma/client, @prisma/adapter-better-sqlite3, prisma)
docker-compose.yml	Updates volumes to named volumes and adds migrate service for running database migrations
Dockerfile	Adds Prisma client generation steps and copies generated files to production image
prisma/migrations/*.sql	Migration files for database schema evolution
prisma/migrations/migration_lock.toml	Locks SQLite as the migration provider

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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