feat: add basic blog features

db/migrations/2026-02-22_18:00_create_blog_tables.sql

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+CREATE XTENSION IF NOT EXISTS "uuid-ossp";
+
+CREATE TABLE posts (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  title VARCHAR(255) NULL UNIQUE,
+  content TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);

db/migrations/2026-03-04_15:23_create_user_tables.sql

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+CREATE TABLE users (
+  id TEXT PRIMARY KEY NOT NULL UNIQUE,
+  username VARCHAR(255)
+);
+
+CREATE TABLE passkeys (
+  id TEXT PRIMARY KEY NOT NULL UNIQUE,
+  public_key BYTEA,
+  webauthn_user__id TEXT UNIQUE,
+  counter BIGINT,
+  device_type VARCHAR(32),
+  transports VARCHAR(255)
+);
+
+-- User/passkey junction table
+CREATE TABLE user_passkeys (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id TEXT NOT NULL,
+  passkey_id TEXT NOT NULL,
+
+  -- Foreign key constraints
+  CONSTRAINT fk_user_passkeys_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+  CONSTRAINT fk_user_passkeys_passkeys FOREIGN KEY (passkey_id) REFERENCES passkeys(id) ON DELETE CASCADE,
+
+  -- Prevent duplicates
+  CONSTRAINT unique_user_passkeys UNIQUE (user_id, passkey_id)
+);
+
+CREATE INDEX index_passkeys ON passkeys (id, webauthn_user__id);