feat: refactor database connection handling and add legacy map loading functionality

- Updated check-connections.mts to use Prisma with PostgreSQL adapter.
- Introduced databaseUrl.ts for resolving database URLs from environment variables.
- Added legacyMapLoader.ts to load and parse legacy map data.
- Implemented scenarioSeeder.ts to seed scenario data into the database.
- Created tests for scenario seeding in scenarioSeeder.test.ts.
- Configured Prisma datasource in prisma.config.ts to support dynamic database URLs.

packages/infra/src/postgres.ts

@@ -1,4 +1,6 @@
 import { Prisma, PrismaClient } from '@prisma/client';
+import { PrismaPg } from '@prisma/adapter-pg';
+import { Pool } from 'pg';
 
 export interface PostgresConfig {
     url: string;
@@ -11,10 +13,21 @@ export interface PostgresConnector {
     disconnect(): Promise<void>;
 }
 
+const buildDatabaseUrlFromEnv = (
+    env: NodeJS.ProcessEnv
+): string => {
+    const host = env.POSTGRES_HOST ?? '127.0.0.1';
+    const port = env.POSTGRES_PORT ?? '15432';
+    const user = env.POSTGRES_USER ?? 'sammo';
+    const password = env.POSTGRES_PASSWORD ?? '';
+    const dbName = env.POSTGRES_DB ?? 'sammo';
+    return `postgresql://${user}:${password}@${host}:${port}/${dbName}?schema=public`;
+};
+
 export const resolvePostgresConfigFromEnv = (
     env: NodeJS.ProcessEnv = process.env
 ): PostgresConfig => {
-    const url = env.DATABASE_URL ?? '';
+    const url = env.DATABASE_URL ?? buildDatabaseUrlFromEnv(env);
     if (!url) {
         throw new Error('DATABASE_URL is required to create a Postgres client.');
     }
@@ -25,18 +38,21 @@ export const resolvePostgresConfigFromEnv = (
 export const createPostgresConnector = (
     config: PostgresConfig
 ): PostgresConnector => {
+    const pool = new Pool({
+        connectionString: config.url,
+    });
+    const adapter = new PrismaPg(pool);
     const prisma = new PrismaClient({
-        datasources: {
-            db: {
-                url: config.url,
-            },
-        },
+        adapter,
         log: config.log,
     });
 
     return {
         prisma,
         connect: () => prisma.$connect(),
-        disconnect: () => prisma.$disconnect(),
+        disconnect: async () => {
+            await prisma.$disconnect();
+            await pool.end();
+        },
     };
 };