feat(story-2.1): add feed model and add-feed-by-url API

migrations/003_create_feeds.up.sql

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+-- Migration: 003_create_feeds
+-- Description: Create feeds and articles tables for RSS management
+
+-- Feeds table
+CREATE TABLE IF NOT EXISTS feeds (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    url VARCHAR(2048) NOT NULL,
+    title VARCHAR(512),
+    description TEXT,
+    site_url VARCHAR(2048),
+    image_url VARCHAR(2048),
+    last_fetched_at TIMESTAMPTZ,
+    fetch_error TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    
+    -- Unique constraint: one user can't add same feed twice
+    UNIQUE(user_id, url)
+);
+
+-- Indexes for feeds
+CREATE INDEX IF NOT EXISTS idx_feeds_user_id ON feeds(user_id);
+CREATE INDEX IF NOT EXISTS idx_feeds_last_fetched ON feeds(last_fetched_at);
+
+-- Articles table
+CREATE TABLE IF NOT EXISTS articles (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    feed_id UUID NOT NULL REFERENCES feeds(id) ON DELETE CASCADE,
+    guid VARCHAR(2048) NOT NULL,
+    title VARCHAR(1024) NOT NULL,
+    url VARCHAR(2048),
+    content TEXT,
+    summary TEXT,
+    author VARCHAR(256),
+    image_url VARCHAR(2048),
+    published_at TIMESTAMPTZ,
+    is_read BOOLEAN NOT NULL DEFAULT FALSE,
+    is_favorite BOOLEAN NOT NULL DEFAULT FALSE,
+    read_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    
+    -- Unique constraint: one article per feed (by guid)
+    UNIQUE(feed_id, guid)
+);
+
+-- Indexes for articles
+CREATE INDEX IF NOT EXISTS idx_articles_feed_id ON articles(feed_id);
+CREATE INDEX IF NOT EXISTS idx_articles_published_at ON articles(published_at DESC);
+CREATE INDEX IF NOT EXISTS idx_articles_is_read ON articles(feed_id, is_read);
+CREATE INDEX IF NOT EXISTS idx_articles_is_favorite ON articles(feed_id, is_favorite);
+
+-- Trigger for feeds updated_at
+CREATE TRIGGER update_feeds_updated_at
+    BEFORE UPDATE ON feeds
+    FOR EACH ROW
+    EXECUTE FUNCTION update_updated_at_column();