feat: database schema - users, decks, cards, progress, tutorials, quiz results

setup/schema.sql

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+-- edu.senex.de Training Platform - Database Schema
+-- Run: docker exec -i postgres psql -U postgres -d edu < schema.sql
+
+-- Users
+CREATE TABLE IF NOT EXISTS users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    display_name VARCHAR(100) NOT NULL,
+    is_admin BOOLEAN DEFAULT false,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Flashcard Decks
+CREATE TABLE IF NOT EXISTS decks (
+    id SERIAL PRIMARY KEY,
+    slug VARCHAR(100) UNIQUE NOT NULL,
+    name VARCHAR(200) NOT NULL,
+    description TEXT DEFAULT '',
+    card_count INT DEFAULT 0,
+    sort_order INT DEFAULT 0,
+    source_file VARCHAR(200),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Flashcards
+CREATE TABLE IF NOT EXISTS cards (
+    id SERIAL PRIMARY KEY,
+    deck_id INT NOT NULL REFERENCES decks(id) ON DELETE CASCADE,
+    question TEXT NOT NULL,
+    answer TEXT NOT NULL,
+    level VARCHAR(20) DEFAULT 'basis',
+    sort_order INT DEFAULT 0,
+    source_file VARCHAR(200),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_cards_deck ON cards(deck_id);
+
+-- SM-2 Spaced Repetition Progress
+CREATE TABLE IF NOT EXISTS card_progress (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    card_id INT NOT NULL REFERENCES cards(id) ON DELETE CASCADE,
+    ease_factor REAL DEFAULT 2.5,
+    interval_days INT DEFAULT 0,
+    repetitions INT DEFAULT 0,
+    next_review DATE DEFAULT CURRENT_DATE,
+    last_rating VARCHAR(10),
+    last_reviewed_at TIMESTAMP,
+    UNIQUE(user_id, card_id)
+);
+CREATE INDEX IF NOT EXISTS idx_card_progress_due ON card_progress(user_id, next_review);
+
+-- Tutorials
+CREATE TABLE IF NOT EXISTS tutorials (
+    id SERIAL PRIMARY KEY,
+    slug VARCHAR(100) UNIQUE NOT NULL,
+    title VARCHAR(200) NOT NULL,
+    description TEXT DEFAULT '',
+    content_md TEXT NOT NULL,
+    duration_min INT,
+    sort_order INT DEFAULT 0,
+    source_file VARCHAR(200),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Tutorial Progress
+CREATE TABLE IF NOT EXISTS tutorial_progress (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    tutorial_id INT NOT NULL REFERENCES tutorials(id) ON DELETE CASCADE,
+    completed BOOLEAN DEFAULT false,
+    completed_at TIMESTAMP,
+    UNIQUE(user_id, tutorial_id)
+);
+
+-- Cheat Sheets
+CREATE TABLE IF NOT EXISTS cheatsheets (
+    id SERIAL PRIMARY KEY,
+    slug VARCHAR(100) UNIQUE NOT NULL,
+    title VARCHAR(200) NOT NULL,
+    category VARCHAR(100) DEFAULT '',
+    content_md TEXT NOT NULL,
+    source_file VARCHAR(200),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Quiz Results
+CREATE TABLE IF NOT EXISTS quiz_results (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    deck_slug VARCHAR(100),
+    quiz_type VARCHAR(50) DEFAULT 'multiple_choice',
+    score_percent INT,
+    total_questions INT,
+    correct_answers INT,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_quiz_results_user ON quiz_results(user_id, created_at DESC);