diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..fc4f632
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,52 @@
+# Pulse RSS Feed Aggregator - Environment Configuration
+
+# =============================================================================
+# DATABASE CONFIGURATION
+# =============================================================================
+
+# Required: Database type - 'sqlite' or 'postgres'
+# Default: sqlite
+PULSE_DATABASE_TYPE=sqlite
+
+# -----------------------------------------------------------------------------
+# SQLite Configuration (used when PULSE_DATABASE_TYPE=sqlite)
+# -----------------------------------------------------------------------------
+
+# Path to SQLite database file
+# Default: ./data/pulse.db
+PULSE_SQLITE_PATH=./data/pulse.db
+
+# -----------------------------------------------------------------------------
+# PostgreSQL Configuration (used when PULSE_DATABASE_TYPE=postgres)
+# -----------------------------------------------------------------------------
+
+# Option 1: Connection string (simplest)
+# Format: postgresql://user:password@host:port/database
+PULSE_DATABASE_URL=postgresql://pulse:password@localhost:5432/pulse
+
+# Option 2: Individual connection parameters (alternative to connection string)
+# PULSE_POSTGRES_HOST=localhost
+# PULSE_POSTGRES_PORT=5432
+# PULSE_POSTGRES_DATABASE=pulse
+# PULSE_POSTGRES_USER=pulse
+# PULSE_POSTGRES_PASSWORD=secret
+
+# =============================================================================
+# EXAMPLES
+# =============================================================================
+
+# Local development with SQLite (default):
+# PULSE_DATABASE_TYPE=sqlite
+# PULSE_SQLITE_PATH=./data/pulse.db
+
+# Production with PostgreSQL using connection string:
+# PULSE_DATABASE_TYPE=postgres
+# PULSE_DATABASE_URL=postgresql://pulse:secret@db.example.com:5432/pulse
+
+# Production with PostgreSQL using individual params:
+# PULSE_DATABASE_TYPE=postgres
+# PULSE_POSTGRES_HOST=db.example.com
+# PULSE_POSTGRES_PORT=5432
+# PULSE_POSTGRES_DATABASE=pulse
+# PULSE_POSTGRES_USER=pulse
+# PULSE_POSTGRES_PASSWORD=secret
diff --git a/infrastructure/db/config.ts b/infrastructure/db/config.ts
new file mode 100644
index 0000000..88926d8
--- /dev/null
+++ b/infrastructure/db/config.ts
@@ -0,0 +1,91 @@
+/**
+ * Database configuration types and loader.
+ * Supports SQLite (local) and PostgreSQL (production) via environment variables.
+ */
+
+export interface SqliteConfig {
+  path: string;
+}
+
+export interface PostgresConfig {
+  host: string;
+  port: number;
+  database: string;
+  user: string;
+  password: string;
+}
+
+export interface PostgresUrlConfig {
+  connectionString: string;
+}
+
+export type DatabaseType = 'sqlite' | 'postgres';
+
+export interface DatabaseConfig {
+  type: DatabaseType;
+  sqlite?: SqliteConfig;
+  postgres?: PostgresConfig | PostgresUrlConfig;
+}
+
+function getEnvVar(name: string, defaultValue?: string): string {
+  const value = process.env[name];
+  if (value === undefined) {
+    if (defaultValue !== undefined) {
+      return defaultValue;
+    }
+    throw new Error(`Missing required environment variable: ${name}`);
+  }
+  return value;
+}
+
+export function loadConfig(): DatabaseConfig {
+  const type = getEnvVar('PULSE_DATABASE_TYPE', 'sqlite') as DatabaseType;
+
+  if (type === 'sqlite') {
+    return {
+      type: 'sqlite',
+      sqlite: {
+        path: getEnvVar('PULSE_SQLITE_PATH', './data/pulse.db'),
+      },
+    };
+  }
+
+  if (type === 'postgres') {
+    const connectionString = process.env.PULSE_DATABASE_URL;
+    
+    if (connectionString) {
+      return {
+        type: 'postgres',
+        postgres: { connectionString },
+      };
+    }
+
+    return {
+      type: 'postgres',
+      postgres: {
+        host: getEnvVar('PULSE_POSTGRES_HOST'),
+        port: parseInt(getEnvVar('PULSE_POSTGRES_PORT', '5432'), 10),
+        database: getEnvVar('PULSE_POSTGRES_DATABASE'),
+        user: getEnvVar('PULSE_POSTGRES_USER'),
+        password: getEnvVar('PULSE_POSTGRES_PASSWORD'),
+      },
+    };
+  }
+
+  throw new Error(`Unsupported database type: ${type}. Use 'sqlite' or 'postgres'.`);
+}
+
+export function validateConfig(config: DatabaseConfig): void {
+  if (config.type === 'sqlite') {
+    if (!config.sqlite) {
+      throw new Error('SQLite configuration missing');
+    }
+    if (!config.sqlite.path) {
+      throw new Error('SQLite path is required');
+    }
+  } else if (config.type === 'postgres') {
+    if (!config.postgres) {
+      throw new Error('PostgreSQL configuration missing');
+    }
+  }
+}
diff --git a/infrastructure/db/connection.ts b/infrastructure/db/connection.ts
new file mode 100644
index 0000000..4682b75
--- /dev/null
+++ b/infrastructure/db/connection.ts
@@ -0,0 +1,58 @@
+/**
+ * Database connection factory.
+ * Creates Kysely instances for SQLite or PostgreSQL based on configuration.
+ */
+
+import { Kysely, SqliteDialect, PostgresDialect } from 'kysely';
+import SqliteDatabase from 'better-sqlite3';
+import { Pool } from 'pg';
+import type { Database } from './database.js';
+import type { DatabaseConfig } from './config.js';
+
+export function createDatabase(config: DatabaseConfig): Kysely<Database> {
+  if (config.type === 'sqlite') {
+    if (!config.sqlite) {
+      throw new Error('SQLite configuration required');
+    }
+
+    const sqliteDb = new SqliteDatabase(config.sqlite.path);
+    sqliteDb.pragma('journal_mode = WAL');
+
+    return new Kysely<Database>({
+      dialect: new SqliteDialect({
+        database: sqliteDb,
+      }),
+    });
+  }
+
+  if (config.type === 'postgres') {
+    if (!config.postgres) {
+      throw new Error('PostgreSQL configuration required');
+    }
+
+    // Check if using connection string or individual params
+    if ('connectionString' in config.postgres) {
+      return new Kysely<Database>({
+        dialect: new PostgresDialect({
+          pool: new Pool({
+            connectionString: config.postgres.connectionString,
+          }),
+        }),
+      });
+    } else {
+      return new Kysely<Database>({
+        dialect: new PostgresDialect({
+          pool: new Pool({
+            host: config.postgres.host,
+            port: config.postgres.port,
+            database: config.postgres.database,
+            user: config.postgres.user,
+            password: config.postgres.password,
+          }),
+        }),
+      });
+    }
+  }
+
+  throw new Error(`Unsupported database type: ${config.type}`);
+}
diff --git a/infrastructure/db/database.ts b/infrastructure/db/database.ts
new file mode 100644
index 0000000..221f7c6
--- /dev/null
+++ b/infrastructure/db/database.ts
@@ -0,0 +1,26 @@
+/**
+ * Kysely database type definitions.
+ * Defines the table schemas for type-safe queries.
+ */
+
+export interface FeedItemTable {
+  id: string;
+  source: string;
+  title: string;
+  url: string;
+  published_at: string; // ISO 8601 format
+  content: string | null;
+  summary: string | null;
+  created_at: string; // ISO 8601 format
+}
+
+export interface SeenIdTable {
+  id: string;
+  seen_at: string; // ISO 8601 format
+}
+
+// Database interface used by Kysely
+export interface Database {
+  feed_items: FeedItemTable;
+  seen_ids: SeenIdTable;
+}
diff --git a/infrastructure/db/index.ts b/infrastructure/db/index.ts
new file mode 100644
index 0000000..009ac19
--- /dev/null
+++ b/infrastructure/db/index.ts
@@ -0,0 +1,35 @@
+/**
+ * Database infrastructure exports.
+ * Provides configured database instance and schema management.
+ */
+
+import { createDatabase } from './connection.js';
+import { loadConfig, validateConfig, type DatabaseConfig } from './config.js';
+import { migrate, reset } from './schema.js';
+import type { Database } from './database.js';
+import type { Kysely } from 'kysely';
+
+// Export types
+export type { Database, FeedItemTable, SeenIdTable } from './database.js';
+export type { DatabaseConfig, DatabaseType, SqliteConfig, PostgresConfig, PostgresUrlConfig } from './config.js';
+
+// Export functions for creating database instances
+export { createDatabase, loadConfig, validateConfig, migrate, reset };
+
+/**
+ * Get a configured database instance.
+ * Uses environment variables for configuration.
+ */
+export function getDatabase(): Kysely<Database> {
+  const config = loadConfig();
+  validateConfig(config);
+  return createDatabase(config);
+}
+
+/**
+ * Get a database instance with explicit config (for testing).
+ */
+export function getDatabaseWithConfig(config: DatabaseConfig): Kysely<Database> {
+  validateConfig(config);
+  return createDatabase(config);
+}
diff --git a/infrastructure/db/schema.ts b/infrastructure/db/schema.ts
new file mode 100644
index 0000000..e964d77
--- /dev/null
+++ b/infrastructure/db/schema.ts
@@ -0,0 +1,54 @@
+/**
+ * Database schema migrations.
+ * Creates tables idempotently.
+ */
+
+import type { Kysely } from 'kysely';
+import type { Database } from './database.js';
+
+export async function migrate(db: Kysely<Database>): Promise<void> {
+  // Create feed_items table
+  await db.schema
+    .createTable('feed_items')
+    .ifNotExists()
+    .addColumn('id', 'varchar(64)', (col) => col.primaryKey())
+    .addColumn('source', 'varchar(2048)', (col) => col.notNull())
+    .addColumn('title', 'varchar(512)', (col) => col.notNull())
+    .addColumn('url', 'varchar(2048)', (col) => col.notNull())
+    .addColumn('published_at', 'varchar(32)', (col) => col.notNull())
+    .addColumn('content', 'text')
+    .addColumn('summary', 'text')
+    .addColumn('created_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
+    .execute();
+
+  // Create indexes for feed_items
+  await db.schema
+    .createIndex('idx_feed_items_source')
+    .ifNotExists()
+    .on('feed_items')
+    .column('source')
+    .execute();
+
+  await db.schema
+    .createIndex('idx_feed_items_published')
+    .ifNotExists()
+    .on('feed_items')
+    .column('published_at')
+    .execute();
+
+  // Create seen_ids table
+  await db.schema
+    .createTable('seen_ids')
+    .ifNotExists()
+    .addColumn('id', 'varchar(64)', (col) => col.primaryKey())
+    .addColumn('seen_at', 'varchar(32)', (col) => col.notNull().defaultTo('CURRENT_TIMESTAMP'))
+    .execute();
+}
+
+export async function reset(db: Kysely<Database>): Promise<void> {
+  // Drop tables (for testing)
+  await db.schema.dropTable('seen_ids').ifExists().execute();
+  await db.schema.dropIndex('idx_feed_items_published').ifExists().execute();
+  await db.schema.dropIndex('idx_feed_items_source').ifExists().execute();
+  await db.schema.dropTable('feed_items').ifExists().execute();
+}
diff --git a/modules/dedup/dedup.test.ts b/modules/dedup/dedup.test.ts
new file mode 100644
index 0000000..a9bca58
--- /dev/null
+++ b/modules/dedup/dedup.test.ts
@@ -0,0 +1,400 @@
+import { describe, it, expect, beforeEach, afterAll } from 'vitest';
+import BetterSqlite3 from 'better-sqlite3';
+import { Kysely, SqliteDialect } from 'kysely';
+import { DatabaseDedup } from './dedup.js';
+import { migrate, reset } from '../../infrastructure/db/schema.js';
+import type { Database } from '../../infrastructure/db/database.js';
+import type { FeedItem } from '../../interfaces/feed.types.js';
+
+describe('DatabaseDedup', () => {
+  let sqliteDb: BetterSqlite3.Database;
+  let db: Kysely<Database>;
+  let dedup: DatabaseDedup;
+
+  beforeEach(async () => {
+    // Create in-memory database for each test
+    sqliteDb = new BetterSqlite3(':memory:');
+    sqliteDb.pragma('journal_mode = WAL');
+
+    db = new Kysely<Database>({
+      dialect: new SqliteDialect({
+        database: sqliteDb,
+      }),
+    });
+
+    // Reset and migrate
+    await reset(db);
+    await migrate(db);
+
+    dedup = new DatabaseDedup(db);
+  });
+
+  afterAll(async () => {
+    await db.destroy();
+  });
+
+  describe('filter', () => {
+    it('returns all items when nothing is marked seen', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 2',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(2);
+      expect(filtered[0].id).toBe('item1');
+      expect(filtered[1].id).toBe('item2');
+    });
+
+    it('excludes items that have been marked seen', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 2',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      // Mark first item as seen
+      await dedup.markSeen([items[0]]);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(1);
+      expect(filtered[0].id).toBe('item2');
+    });
+
+    it('returns empty array when all items are seen', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen(items);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('returns empty array for empty input', async () => {
+      const filtered = await dedup.filter([]);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('handles partial matches correctly', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'seen-item',
+          source: 'https://example.com/feed.xml',
+          title: 'Seen Article',
+          url: 'https://example.com/seen',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'new-item',
+          source: 'https://example.com/feed.xml',
+          title: 'New Article',
+          url: 'https://example.com/new',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+        {
+          id: 'another-seen',
+          source: 'https://example.com/feed.xml',
+          title: 'Another Seen',
+          url: 'https://example.com/another',
+          publishedAt: new Date('2024-09-06T11:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen([items[0], items[2]]);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(1);
+      expect(filtered[0].id).toBe('new-item');
+    });
+  });
+
+  describe('markSeen', () => {
+    it('marks items as seen', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen(items);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('marks multiple items at once', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 2',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen(items);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('handles empty array gracefully', async () => {
+      await dedup.markSeen([]);
+      // Should not throw
+    });
+
+    it('is idempotent - marking same item twice does not error', async () => {
+      const item: FeedItem = {
+        id: 'duplicate-id',
+        source: 'https://example.com/feed.xml',
+        title: 'Article',
+        url: 'https://example.com/article',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+      };
+
+      await dedup.markSeen([item]);
+      await dedup.markSeen([item]); // Should not throw
+
+      const filtered = await dedup.filter([item]);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('marks items incrementally', async () => {
+      const item1: FeedItem = {
+        id: 'item1',
+        source: 'https://example.com/feed.xml',
+        title: 'Article 1',
+        url: 'https://example.com/1',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+      };
+
+      const item2: FeedItem = {
+        id: 'item2',
+        source: 'https://example.com/feed.xml',
+        title: 'Article 2',
+        url: 'https://example.com/2',
+        publishedAt: new Date('2024-09-06T10:00:00Z'),
+      };
+
+      // Mark first item
+      await dedup.markSeen([item1]);
+
+      let filtered = await dedup.filter([item1, item2]);
+      expect(filtered).toHaveLength(1);
+      expect(filtered[0].id).toBe('item2');
+
+      // Mark second item
+      await dedup.markSeen([item2]);
+
+      filtered = await dedup.filter([item1, item2]);
+      expect(filtered).toHaveLength(0);
+    });
+  });
+
+  describe('integration scenarios', () => {
+    it('end-to-end: filter then mark workflow', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'new1',
+          source: 'https://example.com/feed.xml',
+          title: 'New Article 1',
+          url: 'https://example.com/new1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'new2',
+          source: 'https://example.com/feed.xml',
+          title: 'New Article 2',
+          url: 'https://example.com/new2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      // Simulate feed fetch
+      const newItems = await dedup.filter(items);
+      expect(newItems).toHaveLength(2);
+
+      // Mark as seen after display
+      await dedup.markSeen(newItems);
+
+      // Next fetch should return empty
+      const nextFetch = await dedup.filter(items);
+      expect(nextFetch).toHaveLength(0);
+    });
+
+    it('handles items with same IDs from different sources', async () => {
+      // This shouldn't happen with proper ID generation, but test it anyway
+      const items: FeedItem[] = [
+        {
+          id: 'same-hash-id',
+          source: 'https://source1.com/feed.xml',
+          title: 'Article from Source 1',
+          url: 'https://source1.com/article',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'same-hash-id',
+          source: 'https://source2.com/feed.xml',
+          title: 'Article from Source 2',
+          url: 'https://source2.com/article',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      // Mark first as seen
+      await dedup.markSeen([items[0]]);
+
+      // Both should be filtered since they have same ID
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('preserves item data integrity', async () => {
+      const item: FeedItem = {
+        id: 'complete-item',
+        source: 'https://example.com/feed.xml',
+        title: 'Complete Article',
+        url: 'https://example.com/complete',
+        publishedAt: new Date('2024-09-06T09:30:00Z'),
+        summary: 'A summary',
+        content: 'Full content',
+      };
+
+      // Mark as seen
+      await dedup.markSeen([item]);
+
+      // Filter should exclude the item
+      const filtered = await dedup.filter([item]);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('handles large batches efficiently', async () => {
+      // Create 100 items
+      const items: FeedItem[] = Array.from({ length: 100 }, (_, i) => ({
+        id: `batch-item-${i}`,
+        source: 'https://example.com/feed.xml',
+        title: `Article ${i}`,
+        url: `https://example.com/${i}`,
+        publishedAt: new Date(`2024-09-${String(i + 1).padStart(2, '0')}T09:00:00Z`),
+      }));
+
+      // All should be returned initially
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(100);
+
+      // Mark half as seen
+      const seenItems = items.slice(0, 50);
+      await dedup.markSeen(seenItems);
+
+      // Only unseen items should be returned
+      const filteredAgain = await dedup.filter(items);
+      expect(filteredAgain).toHaveLength(50);
+      expect(filteredAgain[0].id).toBe('batch-item-50');
+    });
+  });
+
+  describe('edge cases', () => {
+    it('handles items with special characters in IDs', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item-with-::special::chars',
+          source: 'https://example.com/feed.xml',
+          title: 'Special ID Article',
+          url: 'https://example.com/special',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen(items);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('handles very long IDs', async () => {
+      const longId = 'a'.repeat(64); // Max length per schema
+      const items: FeedItem[] = [
+        {
+          id: longId,
+          source: 'https://example.com/feed.xml',
+          title: 'Long ID Article',
+          url: 'https://example.com/long',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await dedup.markSeen(items);
+
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(0);
+    });
+
+    it('handles duplicate IDs in single filter call', async () => {
+      const item: FeedItem = {
+        id: 'duplicate-in-input',
+        source: 'https://example.com/feed.xml',
+        title: 'Article',
+        url: 'https://example.com/article',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+      };
+
+      // Same item twice in input
+      const items = [item, item];
+
+      // Filter returns both since neither has been marked seen
+      // (filter only removes items from seen_ids table, not deduplicates input)
+      const filtered = await dedup.filter(items);
+      expect(filtered).toHaveLength(2);
+
+      // Mark one as seen
+      await dedup.markSeen([item]);
+
+      // Now both are filtered since they share the same ID
+      const filteredAgain = await dedup.filter(items);
+      expect(filteredAgain).toHaveLength(0);
+    });
+  });
+});
diff --git a/modules/dedup/dedup.ts b/modules/dedup/dedup.ts
new file mode 100644
index 0000000..0336a9b
--- /dev/null
+++ b/modules/dedup/dedup.ts
@@ -0,0 +1,55 @@
+/**
+ * Deduplication module implementation.
+ * Tracks seen item IDs to filter duplicates from feeds.
+ */
+
+import type { Kysely } from 'kysely';
+import type { FeedItem } from '../../interfaces/feed.types.js';
+import type { IDedup } from '../../interfaces/dedup.interface.js';
+import type { Database, SeenIdTable } from '../../infrastructure/db/database.js';
+
+export class DatabaseDedup implements IDedup {
+  private readonly db: Kysely<Database>;
+
+  constructor(db: Kysely<Database>) {
+    this.db = db;
+  }
+
+  async filter(items: FeedItem[]): Promise<FeedItem[]> {
+    if (items.length === 0) {
+      return [];
+    }
+
+    const ids = items.map((item) => item.id);
+
+    // Query which IDs are already in the seen table
+    const seenRows = await this.db
+      .selectFrom('seen_ids')
+      .select('id')
+      .where('id', 'in', ids)
+      .execute();
+
+    const seenIds = new Set(seenRows.map((row) => row.id));
+
+    // Return only items NOT in seen table
+    return items.filter((item) => !seenIds.has(item.id));
+  }
+
+  async markSeen(items: FeedItem[]): Promise<void> {
+    if (items.length === 0) {
+      return;
+    }
+
+    const rows: SeenIdTable[] = items.map((item) => ({
+      id: item.id,
+      seen_at: new Date().toISOString(),
+    }));
+
+    // Insert or ignore (idempotent)
+    await this.db
+      .insertInto('seen_ids')
+      .values(rows)
+      .onConflict((oc) => oc.column('id').doNothing())
+      .execute();
+  }
+}
diff --git a/modules/dedup/index.ts b/modules/dedup/index.ts
new file mode 100644
index 0000000..8da62d2
--- /dev/null
+++ b/modules/dedup/index.ts
@@ -0,0 +1 @@
+export { DatabaseDedup } from './dedup.js';
diff --git a/modules/storage/index.ts b/modules/storage/index.ts
new file mode 100644
index 0000000..06408b8
--- /dev/null
+++ b/modules/storage/index.ts
@@ -0,0 +1 @@
+export { SqlStorage } from './storage.js';
diff --git a/modules/storage/storage.test.ts b/modules/storage/storage.test.ts
new file mode 100644
index 0000000..877ba7e
--- /dev/null
+++ b/modules/storage/storage.test.ts
@@ -0,0 +1,430 @@
+import { describe, it, expect, beforeEach, afterAll } from 'vitest';
+import BetterSqlite3 from 'better-sqlite3';
+import { Kysely, SqliteDialect } from 'kysely';
+import { SqlStorage } from './storage.js';
+import { migrate, reset } from '../../infrastructure/db/schema.js';
+import type { Database } from '../../infrastructure/db/database.js';
+import type { FeedItem } from '../../interfaces/feed.types.js';
+
+describe('SqlStorage', () => {
+  let sqliteDb: BetterSqlite3.Database;
+  let db: Kysely<Database>;
+  let storage: SqlStorage;
+
+  beforeEach(async () => {
+    // Create in-memory database for each test
+    sqliteDb = new BetterSqlite3(':memory:');
+    sqliteDb.pragma('journal_mode = WAL');
+
+    db = new Kysely<Database>({
+      dialect: new SqliteDialect({
+        database: sqliteDb,
+      }),
+    });
+
+    // Reset and migrate
+    await reset(db);
+    await migrate(db);
+
+    storage = new SqlStorage(db);
+  });
+
+  afterAll(async () => {
+    await db.destroy();
+  });
+
+  describe('save', () => {
+    it('saves a single item', async () => {
+      const item: FeedItem = {
+        id: 'abc123',
+        source: 'https://example.com/feed.xml',
+        title: 'Test Article',
+        url: 'https://example.com/article',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+        summary: 'A summary',
+        content: 'Full content',
+      };
+
+      await storage.save([item]);
+
+      const recent = await storage.getRecent(1);
+      expect(recent).toHaveLength(1);
+      expect(recent[0].id).toBe('abc123');
+      expect(recent[0].title).toBe('Test Article');
+    });
+
+    it('saves multiple items in batch', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 1',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article 2',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const recent = await storage.getRecent(10);
+      expect(recent).toHaveLength(2);
+    });
+
+    it('handles empty array gracefully', async () => {
+      await storage.save([]);
+      const recent = await storage.getRecent(10);
+      expect(recent).toHaveLength(0);
+    });
+
+    it('updates existing item on duplicate id (upsert)', async () => {
+      const item: FeedItem = {
+        id: 'same-id',
+        source: 'https://example.com/feed.xml',
+        title: 'Original Title',
+        url: 'https://example.com/article',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+        summary: 'Original summary',
+      };
+
+      await storage.save([item]);
+
+      // Update with new title and content
+      const updatedItem: FeedItem = {
+        ...item,
+        title: 'Updated Title',
+        content: 'Updated content',
+        summary: 'Updated summary',
+      };
+
+      await storage.save([updatedItem]);
+
+      const recent = await storage.getRecent(1);
+      expect(recent).toHaveLength(1);
+      expect(recent[0].title).toBe('Updated Title');
+      expect(recent[0].content).toBe('Updated content');
+    });
+
+    it('preserves other fields during upsert', async () => {
+      const item: FeedItem = {
+        id: 'preserved-id',
+        source: 'https://example.com/feed.xml',
+        title: 'Title',
+        url: 'https://example.com/article',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+        summary: 'Summary',
+        content: 'Content',
+      };
+
+      await storage.save([item]);
+
+      // Update only title
+      const updatedItem: FeedItem = {
+        ...item,
+        title: 'New Title',
+      };
+
+      await storage.save([updatedItem]);
+
+      const recent = await storage.getRecent(1);
+      expect(recent[0].url).toBe('https://example.com/article'); // unchanged
+      expect(recent[0].publishedAt).toEqual(new Date('2024-09-06T09:00:00Z')); // unchanged
+    });
+  });
+
+  describe('getRecent', () => {
+    it('returns items ordered by published date desc', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'old',
+          source: 'https://example.com/feed.xml',
+          title: 'Old Article',
+          url: 'https://example.com/old',
+          publishedAt: new Date('2024-09-05T09:00:00Z'),
+        },
+        {
+          id: 'new',
+          source: 'https://example.com/feed.xml',
+          title: 'New Article',
+          url: 'https://example.com/new',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const recent = await storage.getRecent(10);
+      expect(recent[0].title).toBe('New Article');
+      expect(recent[1].title).toBe('Old Article');
+    });
+
+    it('respects limit parameter', async () => {
+      const items: FeedItem[] = Array.from({ length: 5 }, (_, i) => ({
+        id: `item${i}`,
+        source: 'https://example.com/feed.xml',
+        title: `Article ${i}`,
+        url: `https://example.com/${i}`,
+        publishedAt: new Date(`2024-09-0${i + 1}T09:00:00Z`),
+      }));
+
+      await storage.save(items);
+
+      const recent = await storage.getRecent(2);
+      expect(recent).toHaveLength(2);
+    });
+
+    it('returns empty array when no items', async () => {
+      const recent = await storage.getRecent(10);
+      expect(recent).toHaveLength(0);
+    });
+  });
+
+  describe('getBySource', () => {
+    it('returns items filtered by source', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'source1-item',
+          source: 'https://source1.com/feed.xml',
+          title: 'Source 1 Article',
+          url: 'https://source1.com/article',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'source2-item',
+          source: 'https://source2.com/feed.xml',
+          title: 'Source 2 Article',
+          url: 'https://source2.com/article',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const source1Items = await storage.getBySource('https://source1.com/feed.xml', 10);
+      expect(source1Items).toHaveLength(1);
+      expect(source1Items[0].title).toBe('Source 1 Article');
+    });
+
+    it('respects limit parameter', async () => {
+      const items: FeedItem[] = Array.from({ length: 5 }, (_, i) => ({
+        id: `item${i}`,
+        source: 'https://example.com/feed.xml',
+        title: `Article ${i}`,
+        url: `https://example.com/${i}`,
+        publishedAt: new Date(`2024-09-0${i + 1}T09:00:00Z`),
+      }));
+
+      await storage.save(items);
+
+      const sourceItems = await storage.getBySource('https://example.com/feed.xml', 2);
+      expect(sourceItems).toHaveLength(2);
+    });
+
+    it('returns empty array when no matching source', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article',
+          url: 'https://example.com/article',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const result = await storage.getBySource('https://other.com/feed.xml', 10);
+      expect(result).toHaveLength(0);
+    });
+  });
+
+  describe('search', () => {
+    it('finds items by title', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'JavaScript Tutorial',
+          url: 'https://example.com/js',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Python Guide',
+          url: 'https://example.com/py',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const results = await storage.search('JavaScript');
+      expect(results).toHaveLength(1);
+      expect(results[0].title).toBe('JavaScript Tutorial');
+    });
+
+    it('finds items by summary', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article One',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+          summary: 'Learn about async programming',
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article Two',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+          summary: 'Introduction to types',
+        },
+      ];
+
+      await storage.save(items);
+
+      const results = await storage.search('async');
+      expect(results).toHaveLength(1);
+      expect(results[0].title).toBe('Article One');
+    });
+
+    it('finds items by content', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article One',
+          url: 'https://example.com/1',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+          content: 'Detailed explanation of closures',
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Article Two',
+          url: 'https://example.com/2',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+          content: 'Overview of interfaces',
+        },
+      ];
+
+      await storage.save(items);
+
+      const results = await storage.search('closures');
+      expect(results).toHaveLength(1);
+      expect(results[0].title).toBe('Article One');
+    });
+
+    it('returns multiple matching items', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'React Tutorial',
+          url: 'https://example.com/react',
+          publishedAt: new Date('2024-09-05T09:00:00Z'),
+        },
+        {
+          id: 'item2',
+          source: 'https://example.com/feed.xml',
+          title: 'Vue Guide',
+          url: 'https://example.com/vue',
+          publishedAt: new Date('2024-09-06T10:00:00Z'),
+          summary: 'A framework tutorial',
+        },
+      ];
+
+      await storage.save(items);
+
+      const results = await storage.search('Tutorial');
+      expect(results).toHaveLength(2);
+    });
+
+    it('returns empty array when no matches', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'Article',
+          url: 'https://example.com/article',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      const results = await storage.search('nonexistent');
+      expect(results).toHaveLength(0);
+    });
+
+    it('performs case-sensitive search (as per SQL LIKE)', async () => {
+      const items: FeedItem[] = [
+        {
+          id: 'item1',
+          source: 'https://example.com/feed.xml',
+          title: 'JavaScript',
+          url: 'https://example.com/js',
+          publishedAt: new Date('2024-09-06T09:00:00Z'),
+        },
+      ];
+
+      await storage.save(items);
+
+      // SQLite LIKE is case-insensitive by default for ASCII
+      const results = await storage.search('javascript');
+      expect(results).toHaveLength(1);
+    });
+  });
+
+  describe('FeedItem properties preservation', () => {
+    it('preserves all FeedItem fields', async () => {
+      const item: FeedItem = {
+        id: 'full-item',
+        source: 'https://example.com/feed.xml',
+        title: 'Complete Article',
+        url: 'https://example.com/complete',
+        publishedAt: new Date('2024-09-06T09:30:00Z'),
+        summary: 'A brief summary',
+        content: 'The full article content here',
+      };
+
+      await storage.save([item]);
+
+      const recent = await storage.getRecent(1);
+      const retrieved = recent[0];
+
+      expect(retrieved.id).toBe(item.id);
+      expect(retrieved.source).toBe(item.source);
+      expect(retrieved.title).toBe(item.title);
+      expect(retrieved.url).toBe(item.url);
+      expect(retrieved.publishedAt).toEqual(item.publishedAt);
+      expect(retrieved.summary).toBe(item.summary);
+      expect(retrieved.content).toBe(item.content);
+    });
+
+    it('handles items without optional fields', async () => {
+      const item: FeedItem = {
+        id: 'minimal-item',
+        source: 'https://example.com/feed.xml',
+        title: 'Minimal Article',
+        url: 'https://example.com/minimal',
+        publishedAt: new Date('2024-09-06T09:00:00Z'),
+      };
+
+      await storage.save([item]);
+
+      const recent = await storage.getRecent(1);
+      expect(recent[0].summary).toBeUndefined();
+      expect(recent[0].content).toBeUndefined();
+    });
+  });
+});
diff --git a/modules/storage/storage.ts b/modules/storage/storage.ts
new file mode 100644
index 0000000..0769b00
--- /dev/null
+++ b/modules/storage/storage.ts
@@ -0,0 +1,101 @@
+/**
+ * Storage module implementation.
+ * Persists FeedItems to database using Kysely.
+ */
+
+import type { Kysely } from 'kysely';
+import type { FeedItem } from '../../interfaces/feed.types.js';
+import type { IStorage } from '../../interfaces/storage.interface.js';
+import type { Database, FeedItemTable } from '../../infrastructure/db/database.js';
+
+export class SqlStorage implements IStorage {
+  private readonly db: Kysely<Database>;
+
+  constructor(db: Kysely<Database>) {
+    this.db = db;
+  }
+
+  async save(items: FeedItem[]): Promise<void> {
+    if (items.length === 0) {
+      return;
+    }
+
+    const rows: FeedItemTable[] = items.map((item) => ({
+      id: item.id,
+      source: item.source,
+      title: item.title,
+      url: item.url,
+      published_at: item.publishedAt.toISOString(),
+      content: item.content ?? null,
+      summary: item.summary ?? null,
+      created_at: new Date().toISOString(),
+    }));
+
+    // Upsert: insert or update on conflict
+    await this.db
+      .insertInto('feed_items')
+      .values(rows)
+      .onConflict((oc) =>
+        oc.column('id').doUpdateSet({
+          title: (eb) => eb.ref('excluded.title'),
+          content: (eb) => eb.ref('excluded.content'),
+          summary: (eb) => eb.ref('excluded.summary'),
+        })
+      )
+      .execute();
+  }
+
+  async getRecent(limit: number): Promise<FeedItem[]> {
+    const rows = await this.db
+      .selectFrom('feed_items')
+      .selectAll()
+      .orderBy('published_at', 'desc')
+      .limit(limit)
+      .execute();
+
+    return rows.map(this.rowToFeedItem);
+  }
+
+  async getBySource(source: string, limit: number): Promise<FeedItem[]> {
+    const rows = await this.db
+      .selectFrom('feed_items')
+      .selectAll()
+      .where('source', '=', source)
+      .orderBy('published_at', 'desc')
+      .limit(limit)
+      .execute();
+
+    return rows.map(this.rowToFeedItem);
+  }
+
+  async search(query: string): Promise<FeedItem[]> {
+    const searchTerm = `%${query}%`;
+
+    const rows = await this.db
+      .selectFrom('feed_items')
+      .selectAll()
+      .where((eb) =>
+        eb.or([
+          eb('title', 'like', searchTerm),
+          eb('summary', 'like', searchTerm),
+          eb('content', 'like', searchTerm),
+        ])
+      )
+      .orderBy('published_at', 'desc')
+      .execute();
+
+    return rows.map(this.rowToFeedItem);
+  }
+
+  private rowToFeedItem(row: FeedItemTable): FeedItem {
+    return {
+      id: row.id,
+      source: row.source,
+      title: row.title,
+      url: row.url,
+      publishedAt: new Date(row.published_at),
+      content: row.content ?? undefined,
+      summary: row.summary ?? undefined,
+    };
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 97e1bdc..46d42cf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,11 +8,16 @@
       "name": "pulse",
       "version": "0.1.0",
       "dependencies": {
+        "better-sqlite3": "^12.9.0",
         "fast-xml-parser": "^5.7.3",
+        "kysely": "^0.28.17",
+        "pg": "^8.20.0",
         "undici": "^6.21.0"
       },
       "devDependencies": {
+        "@types/better-sqlite3": "^7.6.13",
         "@types/node": "^22.0.0",
+        "@types/pg": "^8.20.0",
         "tsx": "^4.19.0",
         "typescript": "^5.7.0",
         "vitest": "^2.1.0"
@@ -829,6 +834,16 @@
         "win32"
       ]
     },
+    "node_modules/@types/better-sqlite3": {
+      "version": "7.6.13",
+      "resolved": "https://registry.npmjs.org/@types/better-sqlite3/-/better-sqlite3-7.6.13.tgz",
+      "integrity": "sha512-NMv9ASNARoKksWtsq/SHakpYAYnhBrQgGD8zkLYk/jaK8jUGn08CfEdTRgYhMypUQAfzSP8W6gNLe0q19/t4VA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -846,6 +861,18 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/pg": {
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/@types/pg/-/pg-8.20.0.tgz",
+      "integrity": "sha512-bEPFOaMAHTEP1EzpvHTbmwR8UsFyHSKsRisLIHVMXnpNefSbGA1bD6CVy+qKjGSqmZqNqBDV2azOBo8TgkcVow==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "pg-protocol": "*",
+        "pg-types": "^2.2.0"
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "2.1.9",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.9.tgz",
@@ -969,6 +996,84 @@
         "node": ">=12"
       }
     },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
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+      "dependencies": {
+        "detect-libc": "^2.0.0",
+        "expand-template": "^2.0.3",
+        "github-from-package": "0.0.0",
+        "minimist": "^1.2.3",
+        "mkdirp-classic": "^0.5.3",
+        "napi-build-utils": "^2.0.0",
+        "node-abi": "^3.3.0",
+        "pump": "^3.0.0",
+        "rc": "^1.2.7",
+        "simple-get": "^4.0.0",
+        "tar-fs": "^2.0.0",
+        "tunnel-agent": "^0.6.0"
+      },
+      "bin": {
+        "prebuild-install": "bin.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/pump": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.4.tgz",
+      "integrity": "sha512-VS7sjc6KR7e1ukRFhQSY5LM2uBWAUPiOPa/A3mkKmiMwSmRFUITt0xuj+/lesgnCv+dPIEYlkzrcyXgquIHMcA==",
+      "license": "MIT",
+      "dependencies": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
+    "node_modules/rc": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
+      "license": "(BSD-2-Clause OR MIT OR Apache-2.0)",
+      "dependencies": {
+        "deep-extend": "^0.6.0",
+        "ini": "~1.3.0",
+        "minimist": "^1.2.0",
+        "strip-json-comments": "~2.0.1"
+      },
+      "bin": {
+        "rc": "cli.js"
+      }
+    },
+    "node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/resolve-pkg-maps": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
@@ -1333,6 +1802,38 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/semver": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
+      "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/siginfo": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
@@ -1340,6 +1841,51 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/simple-get": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-4.0.1.tgz",
+      "integrity": "sha512-brv7p5WgH0jmQJr1ZDDfKDOSeWWg+OVypG99A/5vYGPqJ6pxiaHLy8nxtFjBA7oMa01ebA9gfh1uMCFqOuXxvA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "decompress-response": "^6.0.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -1350,6 +1896,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/split2": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/split2/-/split2-4.2.0.tgz",
+      "integrity": "sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==",
+      "license": "ISC",
+      "engines": {
+        "node": ">= 10.x"
+      }
+    },
     "node_modules/stackback": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
@@ -1364,6 +1919,24 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/strnum": {
       "version": "2.2.3",
       "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.2.3.tgz",
@@ -1376,6 +1949,34 @@
       ],
       "license": "MIT"
     },
+    "node_modules/tar-fs": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
+      "integrity": "sha512-mDAjwmZdh7LTT6pNleZ05Yt65HC3E+NiQzl672vQG38jIrehtJk/J3mNwIg+vShQPcLF/LV7CMnDW6vjj6sfYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.1.4"
+      }
+    },
+    "node_modules/tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -1440,6 +2041,18 @@
         "fsevents": "~2.3.3"
       }
     },
+    "node_modules/tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -1470,6 +2083,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
     "node_modules/vite": {
       "version": "5.4.21",
       "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
@@ -2065,6 +2684,21 @@
       "engines": {
         "node": ">=8"
       }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index d54be99..e660f04 100644
--- a/package.json
+++ b/package.json
@@ -8,13 +8,18 @@
     "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
+    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^22.0.0",
+    "@types/pg": "^8.20.0",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
     "vitest": "^2.1.0"
   },
   "dependencies": {
+    "better-sqlite3": "^12.9.0",
     "fast-xml-parser": "^5.7.3",
+    "kysely": "^0.28.17",
+    "pg": "^8.20.0",
     "undici": "^6.21.0"
   }
 }