Initial commit: OpenClaw workspace with habit bot and flashcard app

flashcard_schema.sql

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+-- Flashcard System Schema for Oracle ADB
+-- Run this in SQL Developer or SQLcl
+
+-- Users table (for future SSO)
+CREATE TABLE flashcard_users (
+    user_id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    username VARCHAR2(100) NOT NULL UNIQUE,
+    email VARCHAR2(255),
+    created_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    updated_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    is_active CHAR(1) DEFAULT 'Y',
+    CONSTRAINT flashcard_users_pk PRIMARY KEY (user_id)
+);
+
+-- Flashcard tables
+CREATE TABLE flashcard_decks (
+    deck_id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    user_id NUMBER NOT NULL,
+    name VARCHAR2(200) NOT NULL,
+    description VARCHAR2(1000),
+    language_pair VARCHAR2(20) DEFAULT 'EN-KO',
+    created_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    updated_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    is_active CHAR(1) DEFAULT 'Y',
+    CONSTRAINT flashcard_decks_pk PRIMARY KEY (deck_id),
+    CONSTRAINT flashcard_decks_fk FOREIGN KEY (user_id) REFERENCES flashcard_users(user_id)
+);
+
+CREATE TABLE flashcard_cards (
+    card_id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    deck_id NUMBER NOT NULL,
+    question_en VARCHAR2(2000) NOT NULL,
+    answer_en VARCHAR2(2000),
+    question_ko VARCHAR2(2000) NOT NULL,
+    answer_ko VARCHAR2(2000),
+    example_sentence CLOB,
+    notes CLOB,
+    difficulty_level NUMBER DEFAULT 1 CHECK (difficulty_level BETWEEN 1 AND 5),
+    times_reviewed NUMBER DEFAULT 0,
+    times_correct NUMBER DEFAULT 0,
+    last_reviewed_at TIMESTAMP,
+    next_review_at TIMESTAMP,
+    created_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    updated_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    is_active CHAR(1) DEFAULT 'Y',
+    CONSTRAINT flashcard_cards_fk FOREIGN KEY (deck_id) REFERENCES flashcard_decks(deck_id)
+);
+
+-- Study sessions tracking
+CREATE TABLE flashcard_sessions (
+    session_id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    user_id NUMBER NOT NULL,
+    deck_id NUMBER NOT NULL,
+    started_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    ended_at TIMESTAMP,
+    cards_reviewed NUMBER DEFAULT 0,
+    cards_correct NUMBER DEFAULT 0,
+    cards_incorrect NUMBER DEFAULT 0,
+    CONSTRAINT flashcard_sessions_fk1 FOREIGN KEY (user_id) REFERENCES flashcard_users(user_id),
+    CONSTRAINT flashcard_sessions_fk2 FOREIGN KEY (deck_id) REFERENCES flashcard_decks(deck_id)
+);
+
+-- Study session card results
+CREATE TABLE flashcard_session_results (
+    result_id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    session_id NUMBER NOT NULL,
+    card_id NUMBER NOT NULL,
+    was_correct CHAR(1) NOT NULL,
+    response_time_ms NUMBER,
+    attempted_at TIMESTAMP DEFAULT SYSTIMESTAMP,
+    CONSTRAINT flashcard_results_fk1 FOREIGN KEY (session_id) REFERENCES flashcard_sessions(session_id),
+    CONSTRAINT flashcard_results_fk2 FOREIGN KEY (card_id) REFERENCES flashcard_cards(card_id)
+);
+
+-- Indexes
+CREATE INDEX flashcard_cards_idx1 ON flashcard_cards(deck_id, is_active);
+CREATE INDEX flashcard_cards_idx2 ON flashcard_cards(next_review_at);
+CREATE INDEX flashcard_decks_idx1 ON flashcard_decks(user_id, is_active);
+
+-- Comments for documentation
+COMMENT ON TABLE flashcard_users IS 'User accounts (for future SSO integration)';
+COMMENT ON TABLE flashcard_decks IS 'Flashcard decks organized by user';
+COMMENT ON TABLE flashcard_cards IS 'Individual flashcards with EN/KO translations';
+COMMENT ON TABLE flashcard_sessions IS 'Study session history';
+COMMENT ON TABLE flashcard_session_results IS 'Individual card results during study sessions';