-- Commonwealth Project Ticketing Database Schema
-- Access via: python3 db/connectors/sqlite_connector.py <command>
-- DO NOT use sqlite3 CLI (crashes in Claude Code due to std::bad_alloc bug)

PRAGMA journal_mode=WAL;
PRAGMA foreign_keys=ON;

CREATE TABLE IF NOT EXISTS tickets (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    type TEXT NOT NULL CHECK(type IN ('initiative', 'epic', 'story', 'task', 'bug')),
    parent_id INTEGER REFERENCES tickets(id),
    title TEXT NOT NULL,
    description TEXT,
    status TEXT NOT NULL DEFAULT 'backlog' CHECK(status IN ('backlog', 'ready', 'in_progress', 'review', 'done', 'cancelled')),
    priority TEXT DEFAULT 'medium' CHECK(priority IN ('critical', 'high', 'medium', 'low')),
    assigned_to TEXT,
    decision_ref TEXT,  -- e.g. 'D-010' or 'Q-001'
    sprint_id INTEGER REFERENCES sprints(id),
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS sprints (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    goal TEXT,
    start_date TEXT,
    end_date TEXT,
    status TEXT NOT NULL DEFAULT 'planning' CHECK(status IN ('planning', 'active', 'completed', 'cancelled')),
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS ticket_deps (
    blocker_id INTEGER NOT NULL REFERENCES tickets(id),
    blocked_id INTEGER NOT NULL REFERENCES tickets(id),
    PRIMARY KEY (blocker_id, blocked_id)
);

CREATE TABLE IF NOT EXISTS ticket_history (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    ticket_id INTEGER NOT NULL REFERENCES tickets(id),
    field TEXT NOT NULL,
    old_value TEXT,
    new_value TEXT,
    changed_by TEXT,
    changed_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS ticket_labels (
    ticket_id INTEGER NOT NULL REFERENCES tickets(id),
    label TEXT NOT NULL,
    PRIMARY KEY (ticket_id, label)
);

CREATE INDEX IF NOT EXISTS idx_tickets_status ON tickets(status);
CREATE INDEX IF NOT EXISTS idx_tickets_type ON tickets(type);
CREATE INDEX IF NOT EXISTS idx_tickets_parent ON tickets(parent_id);
CREATE INDEX IF NOT EXISTS idx_tickets_sprint ON tickets(sprint_id);
CREATE INDEX IF NOT EXISTS idx_tickets_assigned ON tickets(assigned_to);
CREATE INDEX IF NOT EXISTS idx_tickets_decision ON tickets(decision_ref);
CREATE INDEX IF NOT EXISTS idx_history_ticket ON ticket_history(ticket_id);