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db/schema.sql

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+-- TACHYON site schema
+-- SQLite. Timestamps stored as ISO-8601 strings (TEXT), sorted lexically = chronologically.
+
+CREATE TABLE IF NOT EXISTS news_posts (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    title       TEXT NOT NULL,
+    content     TEXT NOT NULL,
+    created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+CREATE TABLE IF NOT EXISTS media_items (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    title       TEXT NOT NULL,
+    media_type  TEXT NOT NULL CHECK (media_type IN ('image', 'video')),
+    url         TEXT NOT NULL,
+    created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+-- Registered/tracked users (distinct from "who is currently online" -- see sessions below)
+CREATE TABLE IF NOT EXISTS users (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    username    TEXT NOT NULL UNIQUE,
+    joined_at   TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    last_seen_at TEXT
+);
+
+-- One row per active session; presence of a row (or non-null ended_at) drives "current users"
+CREATE TABLE IF NOT EXISTS sessions (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    started_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    ended_at    TEXT
+);
+
+CREATE TABLE IF NOT EXISTS activity_log (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    description TEXT NOT NULL,
+    created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+-- Freeform key/value store for the "General Statistics" cards (build number, version, etc.)
+CREATE TABLE IF NOT EXISTS site_stats (
+    key         TEXT PRIMARY KEY,
+    value       TEXT NOT NULL,
+    updated_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_news_created_at ON news_posts(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_media_created_at ON media_items(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_activity_created_at ON activity_log(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_sessions_active ON sessions(ended_at);