diff --git a/deno.json b/deno.json
index 0774fd9..d04e960 100644
--- a/deno.json
+++ b/deno.json
@@ -14,7 +14,9 @@
   "imports": {
     "@/": "./src/",
     "@nostrify/nostrify": "jsr:@nostrify/nostrify@^0.9.7",
-    "~/fixtures/": "./fixtures/"
+    "~/fixtures/": "./fixtures/",
+    "kysely": "npm:kysely@^0.26.3",
+    "kysely_deno_postgres": "https://deno.land/x/kysely_deno_postgres@v0.4.0/mod.ts"
   },
   "lint": {
     "include": ["src/", "scripts/"],
diff --git a/src/db.ts b/src/db.ts
index 152b198..7125f13 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -1,93 +1,10 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
 
-import { FileMigrationProvider, Kysely, Migrator, PolySqliteDialect } from '@/deps.ts';
-import { Conf } from '@/config.ts';
-import { setPragma } from '@/pragma.ts';
-import SqliteWorker from '@/workers/sqlite.ts';
+import { DittoDB } from '@/db/DittoDB.ts';
+import { FileMigrationProvider, Migrator } from '@/deps.ts';
 
-interface DittoDB {
-  events: EventRow;
-  events_fts: EventFTSRow;
-  tags: TagRow;
-  relays: RelayRow;
-  unattached_media: UnattachedMediaRow;
-  author_stats: AuthorStatsRow;
-  event_stats: EventStatsRow;
-  pubkey_domains: PubkeyDomainRow;
-}
-
-interface AuthorStatsRow {
-  pubkey: string;
-  followers_count: number;
-  following_count: number;
-  notes_count: number;
-}
-
-interface EventStatsRow {
-  event_id: string;
-  replies_count: number;
-  reposts_count: number;
-  reactions_count: number;
-}
-
-interface EventRow {
-  id: string;
-  kind: number;
-  pubkey: string;
-  content: string;
-  created_at: number;
-  tags: string;
-  sig: string;
-  deleted_at: number | null;
-}
-
-interface EventFTSRow {
-  id: string;
-  content: string;
-}
-
-interface TagRow {
-  tag: string;
-  value: string;
-  event_id: string;
-}
-
-interface RelayRow {
-  url: string;
-  domain: string;
-  active: boolean;
-}
-
-interface UnattachedMediaRow {
-  id: string;
-  pubkey: string;
-  url: string;
-  data: string;
-  uploaded_at: Date;
-}
-
-interface PubkeyDomainRow {
-  pubkey: string;
-  domain: string;
-  last_updated_at: number;
-}
-
-const sqliteWorker = new SqliteWorker();
-await sqliteWorker.open(Conf.dbPath);
-
-const db = new Kysely<DittoDB>({
-  dialect: new PolySqliteDialect({
-    database: sqliteWorker,
-  }),
-});
-
-// Set PRAGMA values.
-await Promise.all([
-  setPragma(db, 'synchronous', 'normal'),
-  setPragma(db, 'temp_store', 'memory'),
-  setPragma(db, 'mmap_size', Conf.sqlite.mmapSize),
-]);
+const db = await DittoDB.getInstance();
 
 const migrator = new Migrator({
   db,
@@ -120,4 +37,4 @@ async function migrate() {
 
 await migrate();
 
-export { type AuthorStatsRow, db, type DittoDB, type EventRow, type EventStatsRow, type TagRow };
+export { db };
diff --git a/src/db/DittoDB.ts b/src/db/DittoDB.ts
new file mode 100644
index 0000000..e27f92f
--- /dev/null
+++ b/src/db/DittoDB.ts
@@ -0,0 +1,20 @@
+import { Conf } from '@/config.ts';
+import { DittoPostgres } from '@/db/adapters/DittoPostgres.ts';
+import { DittoSQLite } from '@/db/adapters/DittoSQLite.ts';
+import { DittoTables } from '@/db/DittoTables.ts';
+import { Kysely } from '@/deps.ts';
+
+export class DittoDB {
+  static getInstance(): Promise<Kysely<DittoTables>> {
+    const { databaseUrl } = Conf;
+
+    switch (databaseUrl.protocol) {
+      case 'sqlite:':
+        return DittoSQLite.getInstance();
+      case 'postgres:':
+        return DittoPostgres.getInstance();
+      default:
+        throw new Error('Unsupported database URL.');
+    }
+  }
+}
diff --git a/src/db/DittoTables.ts b/src/db/DittoTables.ts
new file mode 100644
index 0000000..79fec5d
--- /dev/null
+++ b/src/db/DittoTables.ts
@@ -0,0 +1,66 @@
+export interface DittoTables {
+  events: EventRow;
+  events_fts: EventFTSRow;
+  tags: TagRow;
+  relays: RelayRow;
+  unattached_media: UnattachedMediaRow;
+  author_stats: AuthorStatsRow;
+  event_stats: EventStatsRow;
+  pubkey_domains: PubkeyDomainRow;
+}
+
+interface AuthorStatsRow {
+  pubkey: string;
+  followers_count: number;
+  following_count: number;
+  notes_count: number;
+}
+
+interface EventStatsRow {
+  event_id: string;
+  replies_count: number;
+  reposts_count: number;
+  reactions_count: number;
+}
+
+interface EventRow {
+  id: string;
+  kind: number;
+  pubkey: string;
+  content: string;
+  created_at: number;
+  tags: string;
+  sig: string;
+  deleted_at: number | null;
+}
+
+interface EventFTSRow {
+  id: string;
+  content: string;
+}
+
+interface TagRow {
+  tag: string;
+  value: string;
+  event_id: string;
+}
+
+interface RelayRow {
+  url: string;
+  domain: string;
+  active: boolean;
+}
+
+interface UnattachedMediaRow {
+  id: string;
+  pubkey: string;
+  url: string;
+  data: string;
+  uploaded_at: number;
+}
+
+interface PubkeyDomainRow {
+  pubkey: string;
+  domain: string;
+  last_updated_at: number;
+}
diff --git a/src/db/adapters/DittoPostgres.ts b/src/db/adapters/DittoPostgres.ts
new file mode 100644
index 0000000..f8a5112
--- /dev/null
+++ b/src/db/adapters/DittoPostgres.ts
@@ -0,0 +1,35 @@
+import { Kysely, PostgresAdapter, PostgresIntrospector, PostgresQueryCompiler } from 'kysely';
+import { PostgreSQLDriver } from 'kysely_deno_postgres';
+
+import { DittoTables } from '@/db/DittoTables.ts';
+
+export class DittoPostgres {
+  static db: Kysely<DittoTables> | undefined;
+
+  // deno-lint-ignore require-await
+  static async getInstance(): Promise<Kysely<DittoTables>> {
+    if (!this.db) {
+      this.db = new Kysely({
+        dialect: {
+          createAdapter() {
+            return new PostgresAdapter();
+          },
+          // @ts-ignore mismatched kysely versions probably
+          createDriver() {
+            return new PostgreSQLDriver({
+              connectionString: Deno.env.get('DATABASE_URL'),
+            });
+          },
+          createIntrospector(db: Kysely<unknown>) {
+            return new PostgresIntrospector(db);
+          },
+          createQueryCompiler() {
+            return new PostgresQueryCompiler();
+          },
+        },
+      });
+    }
+
+    return this.db;
+  }
+}
diff --git a/src/db/adapters/DittoSQLite.ts b/src/db/adapters/DittoSQLite.ts
new file mode 100644
index 0000000..c91407a
--- /dev/null
+++ b/src/db/adapters/DittoSQLite.ts
@@ -0,0 +1,54 @@
+import { Conf } from '@/config.ts';
+import { DittoTables } from '@/db/DittoTables.ts';
+import { Kysely, PolySqliteDialect, sql } from '@/deps.ts';
+import SqliteWorker from '@/workers/sqlite.ts';
+
+export class DittoSQLite {
+  static db: Kysely<DittoTables> | undefined;
+
+  static async getInstance(): Promise<Kysely<DittoTables>> {
+    if (!this.db) {
+      const sqliteWorker = new SqliteWorker();
+      await sqliteWorker.open(this.path);
+
+      this.db = new Kysely<DittoTables>({
+        dialect: new PolySqliteDialect({
+          database: sqliteWorker,
+        }),
+      });
+
+      // Set PRAGMA values.
+      await Promise.all([
+        sql`PRAGMA synchronous = normal`.execute(this.db),
+        sql`PRAGMA temp_store = memory`.execute(this.db),
+        sql`PRAGMA foreign_keys = ON`.execute(this.db),
+        sql`PRAGMA auto_vacuum = FULL`.execute(this.db),
+        sql`PRAGMA journal_mode = WAL`.execute(this.db),
+        sql.raw(`PRAGMA mmap_size = ${Conf.sqlite.mmapSize}`).execute(this.db),
+      ]);
+    }
+    return this.db;
+  }
+
+  /** Get the relative or absolute path based on the `DATABASE_URL`. */
+  static get path() {
+    if (Deno.env.get('DATABASE_URL') === 'sqlite://:memory:') {
+      return ':memory:';
+    }
+
+    const { host, pathname } = Conf.databaseUrl;
+
+    if (!pathname) return '';
+
+    // Get relative path.
+    if (host === '') {
+      return pathname;
+    } else if (host === '.') {
+      return pathname;
+    } else if (host) {
+      return host + pathname;
+    }
+
+    return '';
+  }
+}
diff --git a/src/db/migrations/000_create_events.ts b/src/db/migrations/000_create_events.ts
index 8422071..158551b 100644
--- a/src/db/migrations/000_create_events.ts
+++ b/src/db/migrations/000_create_events.ts
@@ -1,4 +1,4 @@
-import { Kysely, sql } from '@/deps.ts';
+import { Kysely } from '@/deps.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
   await db.schema
@@ -21,13 +21,6 @@ export async function up(db: Kysely<any>): Promise<void> {
     .addColumn('event_id', 'text', (col) => col.notNull())
     .execute();
 
-  await db.schema
-    .createTable('users')
-    .addColumn('pubkey', 'text', (col) => col.primaryKey())
-    .addColumn('username', 'text', (col) => col.notNull().unique())
-    .addColumn('inserted_at', 'datetime', (col) => col.notNull().defaultTo(sql`CURRENT_TIMESTAMP`))
-    .execute();
-
   await db.schema
     .createIndex('idx_events_kind')
     .on('events')
diff --git a/src/db/migrations/002_events_fts.ts b/src/db/migrations/002_events_fts.ts
index c0341c1..9324195 100644
--- a/src/db/migrations/002_events_fts.ts
+++ b/src/db/migrations/002_events_fts.ts
@@ -1,9 +1,12 @@
+import { Conf } from '@/config.ts';
 import { Kysely, sql } from '@/deps.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
-  await sql`CREATE VIRTUAL TABLE events_fts USING fts5(id, content)`.execute(db);
+  if (Conf.databaseUrl.protocol === 'sqlite:') {
+    await sql`CREATE VIRTUAL TABLE events_fts USING fts5(id, content)`.execute(db);
+  }
 }
 
 export async function down(db: Kysely<any>): Promise<void> {
-  await db.schema.dropTable('events_fts').execute();
+  await db.schema.dropTable('events_fts').ifExists().execute();
 }
diff --git a/src/db/migrations/003_events_admin.ts b/src/db/migrations/003_events_admin.ts
index e481a59..8469fc2 100644
--- a/src/db/migrations/003_events_admin.ts
+++ b/src/db/migrations/003_events_admin.ts
@@ -1,10 +1,6 @@
 import { Kysely } from '@/deps.ts';
 
-export async function up(db: Kysely<any>): Promise<void> {
-  await db.schema
-    .alterTable('users')
-    .addColumn('admin', 'boolean', (col) => col.defaultTo(false))
-    .execute();
+export async function up(_db: Kysely<any>): Promise<void> {
 }
 
 export async function down(db: Kysely<any>): Promise<void> {
diff --git a/src/db/migrations/004_add_user_indexes.ts b/src/db/migrations/004_add_user_indexes.ts
index e77693b..929181c 100644
--- a/src/db/migrations/004_add_user_indexes.ts
+++ b/src/db/migrations/004_add_user_indexes.ts
@@ -1,17 +1,6 @@
 import { Kysely } from '@/deps.ts';
 
-export async function up(db: Kysely<any>): Promise<void> {
-  await db.schema
-    .createIndex('idx_users_pubkey')
-    .on('users')
-    .column('pubkey')
-    .execute();
-
-  await db.schema
-    .createIndex('idx_users_username')
-    .on('users')
-    .column('username')
-    .execute();
+export async function up(_db: Kysely<any>): Promise<void> {
 }
 
 export async function down(db: Kysely<any>): Promise<void> {
diff --git a/src/db/migrations/006_pragma.ts b/src/db/migrations/006_pragma.ts
index e9dbad1..2639e81 100644
--- a/src/db/migrations/006_pragma.ts
+++ b/src/db/migrations/006_pragma.ts
@@ -1,12 +1,7 @@
-import { Kysely, sql } from '@/deps.ts';
+import { Kysely } from '@/deps.ts';
 
-export async function up(db: Kysely<any>): Promise<void> {
-  await sql`PRAGMA foreign_keys = ON`.execute(db);
-  await sql`PRAGMA auto_vacuum = FULL`.execute(db);
-  await sql`VACUUM`.execute(db);
+export async function up(_db: Kysely<any>): Promise<void> {
 }
 
-export async function down(db: Kysely<any>): Promise<void> {
-  await sql`PRAGMA foreign_keys = OFF`.execute(db);
-  await sql`PRAGMA auto_vacuum = NONE`.execute(db);
+export async function down(_db: Kysely<any>): Promise<void> {
 }
diff --git a/src/db/migrations/007_unattached_media.ts b/src/db/migrations/007_unattached_media.ts
index a2b36a2..1887111 100644
--- a/src/db/migrations/007_unattached_media.ts
+++ b/src/db/migrations/007_unattached_media.ts
@@ -1,4 +1,4 @@
-import { Kysely, sql } from '@/deps.ts';
+import { Kysely } from '@/deps.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
   await db.schema
@@ -7,7 +7,7 @@ export async function up(db: Kysely<any>): Promise<void> {
     .addColumn('pubkey', 'text', (c) => c.notNull())
     .addColumn('url', 'text', (c) => c.notNull())
     .addColumn('data', 'text', (c) => c.notNull())
-    .addColumn('uploaded_at', 'datetime', (c) => c.notNull().defaultTo(sql`CURRENT_TIMESTAMP`))
+    .addColumn('uploaded_at', 'bigint', (c) => c.notNull())
     .execute();
 
   await db.schema
diff --git a/src/db/migrations/008_wal.ts b/src/db/migrations/008_wal.ts
index 7f96226..2639e81 100644
--- a/src/db/migrations/008_wal.ts
+++ b/src/db/migrations/008_wal.ts
@@ -1,9 +1,7 @@
-import { Kysely, sql } from '@/deps.ts';
+import { Kysely } from '@/deps.ts';
 
-export async function up(db: Kysely<any>): Promise<void> {
-  await sql`PRAGMA journal_mode = WAL`.execute(db);
+export async function up(_db: Kysely<any>): Promise<void> {
 }
 
-export async function down(db: Kysely<any>): Promise<void> {
-  await sql`PRAGMA journal_mode = DELETE`.execute(db);
+export async function down(_db: Kysely<any>): Promise<void> {
 }
diff --git a/src/db/migrations/010_drop_users.ts b/src/db/migrations/010_drop_users.ts
index 9649b64..6cd83c0 100644
--- a/src/db/migrations/010_drop_users.ts
+++ b/src/db/migrations/010_drop_users.ts
@@ -1,7 +1,7 @@
 import { Kysely } from '@/deps.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
-  await db.schema.dropTable('users').execute();
+  await db.schema.dropTable('users').ifExists().execute();
 }
 
 export async function down(_db: Kysely<any>): Promise<void> {
diff --git a/src/db/unattached-media.ts b/src/db/unattached-media.ts
index ae9d882..3761947 100644
--- a/src/db/unattached-media.ts
+++ b/src/db/unattached-media.ts
@@ -7,14 +7,14 @@ interface UnattachedMedia {
   pubkey: string;
   url: string;
   data: MediaData;
-  uploaded_at: Date;
+  uploaded_at: number;
 }
 
 /** Add unattached media into the database. */
 async function insertUnattachedMedia(media: Omit<UnattachedMedia, 'id' | 'uploaded_at'>) {
   const result = {
     id: uuid62.v4(),
-    uploaded_at: new Date(),
+    uploaded_at: Date.now(),
     ...media,
   };
 
@@ -41,7 +41,7 @@ function selectUnattachedMediaQuery() {
 function getUnattachedMedia(until: Date) {
   return selectUnattachedMediaQuery()
     .leftJoin('tags', 'unattached_media.url', 'tags.value')
-    .where('uploaded_at', '<', until)
+    .where('uploaded_at', '<', until.getTime())
     .execute();
 }
 
diff --git a/src/pragma.ts b/src/pragma.ts
deleted file mode 100644
index f5aa8e4..0000000
--- a/src/pragma.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { type Kysely, sql } from '@/deps.ts';
-
-/** Set the PRAGMA and then read back its value to confirm. */
-function setPragma(db: Kysely<any>, pragma: string, value: string | number) {
-  return sql.raw(`PRAGMA ${pragma} = ${value}`).execute(db);
-}
-
-/** Get value of PRAGMA from the database. */
-async function getPragma(db: Kysely<any>, pragma: string) {
-  const result = await sql.raw(`PRAGMA ${pragma}`).execute(db);
-  const row = result.rows[0] as Record<string, unknown> | undefined;
-  return row?.[pragma];
-}
-
-export { getPragma, setPragma };
diff --git a/src/stats.ts b/src/stats.ts
index 884778e..48cc41b 100644
--- a/src/stats.ts
+++ b/src/stats.ts
@@ -1,11 +1,12 @@
 import { NostrEvent } from '@nostrify/nostrify';
-import { type AuthorStatsRow, db, type DittoDB, type EventStatsRow } from '@/db.ts';
+import { db } from '@/db.ts';
+import { DittoTables } from '@/db/DittoTables.ts';
 import { Debug, type InsertQueryBuilder } from '@/deps.ts';
 import { eventsDB } from '@/storages.ts';
 import { findReplyTag } from '@/tags.ts';
 
-type AuthorStat = keyof Omit<AuthorStatsRow, 'pubkey'>;
-type EventStat = keyof Omit<EventStatsRow, 'event_id'>;
+type AuthorStat = keyof Omit<DittoTables['author_stats'], 'pubkey'>;
+type EventStat = keyof Omit<DittoTables['event_stats'], 'event_id'>;
 
 type AuthorStatDiff = ['author_stats', pubkey: string, stat: AuthorStat, diff: number];
 type EventStatDiff = ['event_stats', eventId: string, stat: EventStat, diff: number];
@@ -16,7 +17,7 @@ const debug = Debug('ditto:stats');
 /** Store stats for the event in LMDB. */
 async function updateStats(event: NostrEvent) {
   let prev: NostrEvent | undefined;
-  const queries: InsertQueryBuilder<DittoDB, any, unknown>[] = [];
+  const queries: InsertQueryBuilder<DittoTables, any, unknown>[] = [];
 
   // Kind 3 is a special case - replace the count with the new list.
   if (event.kind === 3) {
@@ -99,8 +100,8 @@ async function getStatsDiff(event: NostrEvent, prev: NostrEvent | undefined): Pr
 
 /** Create an author stats query from the list of diffs. */
 function authorStatsQuery(diffs: AuthorStatDiff[]) {
-  const values: AuthorStatsRow[] = diffs.map(([_, pubkey, stat, diff]) => {
-    const row: AuthorStatsRow = {
+  const values: DittoTables['author_stats'][] = diffs.map(([_, pubkey, stat, diff]) => {
+    const row: DittoTables['author_stats'] = {
       pubkey,
       followers_count: 0,
       following_count: 0,
@@ -125,8 +126,8 @@ function authorStatsQuery(diffs: AuthorStatDiff[]) {
 
 /** Create an event stats query from the list of diffs. */
 function eventStatsQuery(diffs: EventStatDiff[]) {
-  const values: EventStatsRow[] = diffs.map(([_, event_id, stat, diff]) => {
-    const row: EventStatsRow = {
+  const values: DittoTables['event_stats'][] = diffs.map(([_, event_id, stat, diff]) => {
+    const row: DittoTables['event_stats'] = {
       event_id,
       replies_count: 0,
       reposts_count: 0,
diff --git a/src/storages/events-db.ts b/src/storages/events-db.ts
index 3359064..6d80f70 100644
--- a/src/storages/events-db.ts
+++ b/src/storages/events-db.ts
@@ -1,6 +1,6 @@
 import { NIP50, NostrEvent, NostrFilter, NStore } from '@nostrify/nostrify';
 import { Conf } from '@/config.ts';
-import { type DittoDB } from '@/db.ts';
+import { DittoTables } from '@/db/DittoTables.ts';
 import { Debug, Kysely, type SelectQueryBuilder } from '@/deps.ts';
 import { normalizeFilters } from '@/filter.ts';
 import { DittoEvent } from '@/interfaces/DittoEvent.ts';
@@ -33,7 +33,7 @@ const tagConditions: Record<string, TagCondition> = {
   'role': ({ event, count }) => event.kind === 30361 && count === 0,
 };
 
-type EventQuery = SelectQueryBuilder<DittoDB, 'events', {
+type EventQuery = SelectQueryBuilder<DittoTables, 'events', {
   id: string;
   tags: string;
   kind: number;
@@ -58,10 +58,11 @@ type EventQuery = SelectQueryBuilder<DittoDB, 'events', {
 
 /** SQLite database storage adapter for Nostr events. */
 class EventsDB implements NStore {
-  #db: Kysely<DittoDB>;
+  #db: Kysely<DittoTables>;
   #debug = Debug('ditto:db:events');
+  private protocol = Conf.databaseUrl.protocol;
 
-  constructor(db: Kysely<DittoDB>) {
+  constructor(db: Kysely<DittoTables>) {
     this.#db = db;
   }
 
@@ -82,8 +83,10 @@ class EventsDB implements NStore {
           .execute();
       }
 
+      const protocol = this.protocol;
       /** Add search data to the FTS table. */
       async function indexSearch() {
+        if (protocol !== 'sqlite:') return;
         const searchContent = buildSearchContent(event);
         if (!searchContent) return;
         await trx.insertInto('events_fts')
@@ -143,7 +146,7 @@ class EventsDB implements NStore {
   }
 
   /** Build the query for a filter. */
-  getFilterQuery(db: Kysely<DittoDB>, filter: NostrFilter): EventQuery {
+  getFilterQuery(db: Kysely<DittoTables>, filter: NostrFilter): EventQuery {
     let query = db
       .selectFrom('events')
       .select([
@@ -194,7 +197,7 @@ class EventsDB implements NStore {
       }
     }
 
-    if (filter.search) {
+    if (filter.search && this.protocol === 'sqlite:') {
       query = query
         .innerJoin('events_fts', 'events_fts.id', 'events.id')
         .where('events_fts.content', 'match', JSON.stringify(filter.search));
@@ -315,7 +318,7 @@ class EventsDB implements NStore {
   }
 
   /** Delete events from each table. Should be run in a transaction! */
-  async deleteEventsTrx(db: Kysely<DittoDB>, filters: NostrFilter[]) {
+  async deleteEventsTrx(db: Kysely<DittoTables>, filters: NostrFilter[]) {
     if (!filters.length) return Promise.resolve();
     this.#debug('DELETE', JSON.stringify(filters));
 
diff --git a/src/workers/trends.worker.ts b/src/workers/trends.worker.ts
index fd9e8fe..df06fbb 100644
--- a/src/workers/trends.worker.ts
+++ b/src/workers/trends.worker.ts
@@ -28,7 +28,7 @@ export const TrendsWorker = {
       CREATE TABLE IF NOT EXISTS tag_usages (
         tag TEXT NOT NULL COLLATE NOCASE,
         pubkey8 TEXT NOT NULL,
-        inserted_at DATETIME NOT NULL
+        inserted_at INTEGER NOT NULL
       );
 
       CREATE INDEX IF NOT EXISTS idx_time_tag ON tag_usages(inserted_at, tag);