Refactor database handling to exclusively support PostgreSQL

- Removed SQLite support from the configuration and database initialization logic.
- Updated database migration scripts to focus solely on PostgreSQL migrations.
- Simplified logging messages to reflect PostgreSQL usage.
- Adjusted database schema definitions to remove SQLite-specific types and structures.
- Modified tests to ensure compatibility with PostgreSQL, including changes to table creation and data types.
- Cleaned up unused imports and code related to SQLite.

tests/database/migrate.test.ts

@@ -1,21 +1,8 @@
-import { mkdtempSync, rmSync } from "node:fs";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
 import { describe, expect, it } from "vitest";
-import { initializeMigrationSqliteDatabase } from "../../src/database/migrate";
+import { runMigrations } from "../../src/database/migrate";
 
-describe("initializeMigrationSqliteDatabase", () => {
-  it("creates a SQLite DB with WAL journal mode", () => {
-    const dir = mkdtempSync(join(tmpdir(), "bete-migrate-"));
-    const dbPath = join(dir, "test.db");
-    const { sqlite, db } = initializeMigrationSqliteDatabase(dbPath);
-
-    try {
-      expect(db).toBeDefined();
-      expect(sqlite.pragma("journal_mode", { simple: true })).toBe("wal");
-    } finally {
-      sqlite.close();
-      rmSync(dir, { recursive: true, force: true });
-    }
+describe("runMigrations", () => {
+  it("exports the PostgreSQL migration runner", () => {
+    expect(runMigrations).toBeTypeOf("function");
   });
 });