Add complete database schema and ORM models

Schema (002_tables.sql):
- users: accounts with nick, password hash, timestamps
- auth_tokens: per-device tokens with expiry, linked to users
- channels: chat rooms with topic and mode flags
- channel_members: membership with per-user modes (+o, +v)
- messages: channel/DM history with structured JSON meta
- message_queue: per-user pending delivery queue
- sessions: server-held session state with idle timeout
- server_links: federation peer configuration

Models (internal/models/):
- All models embed Base for database access
- Relation methods on models: User.Channels(), User.QueuedMessages(),
  Channel.Members(), Channel.RecentMessages(), ChannelMember.User(),
  ChannelMember.Channel(), AuthToken.User(), Session.User()
- IDs are UUIDs (TEXT), not auto-increment integers
- JSON tags use camelCase per lint rules

All tables verified: migrations apply cleanly, 0 lint issues.

internal/db/db.go

@@ -11,7 +11,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"time"
 
 	"git.eeqj.de/sneak/chat/internal/config"
 	"git.eeqj.de/sneak/chat/internal/logger"
@@ -51,19 +50,9 @@ func (s *Database) GetDB() *sql.DB {
 	return s.db
 }
 
-// NewChannel creates a Channel model instance with the db reference injected.
-func (s *Database) NewChannel(id int64, name, topic, modes string, createdAt, updatedAt time.Time) *models.Channel {
-	c := &models.Channel{
-		ID:        id,
-		Name:      name,
-		Topic:     topic,
-		Modes:     modes,
-		CreatedAt: createdAt,
-		UpdatedAt: updatedAt,
-	}
-	c.SetDB(s)
-
-	return c
+// Hydrate injects the database reference into any model that embeds Base.
+func (s *Database) Hydrate(m interface{ SetDB(d models.DB) }) {
+	m.SetDB(s)
 }
 
 // New creates a new Database instance and registers lifecycle hooks.

internal/db/schema/002_tables.sql

@@ -1,8 +1,85 @@
-CREATE TABLE IF NOT EXISTS channels (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name TEXT NOT NULL UNIQUE,
-    topic TEXT NOT NULL DEFAULT '',
-    modes TEXT NOT NULL DEFAULT '',
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+-- Users: accounts and authentication
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY,                           -- UUID
+    nick TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    last_seen_at DATETIME
+);
+
+-- Auth tokens: one user can have multiple active tokens (multiple devices)
+CREATE TABLE IF NOT EXISTS auth_tokens (
+    token TEXT PRIMARY KEY,                        -- random token string
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    expires_at DATETIME,                           -- NULL = no expiry
+    last_used_at DATETIME
+);
+CREATE INDEX IF NOT EXISTS idx_auth_tokens_user_id ON auth_tokens(user_id);
+
+-- Channels: chat rooms
+CREATE TABLE IF NOT EXISTS channels (
+    id TEXT PRIMARY KEY,                           -- UUID
+    name TEXT NOT NULL UNIQUE,                     -- #general, etc.
+    topic TEXT NOT NULL DEFAULT '',
+    modes TEXT NOT NULL DEFAULT '',                -- +i, +m, +s, +t, +n
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Channel members: who is in which channel, with per-user modes
+CREATE TABLE IF NOT EXISTS channel_members (
+    channel_id TEXT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    modes TEXT NOT NULL DEFAULT '',                -- +o (operator), +v (voice)
+    joined_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (channel_id, user_id)
+);
+CREATE INDEX IF NOT EXISTS idx_channel_members_user_id ON channel_members(user_id);
+
+-- Messages: channel and DM history (rotated per MAX_HISTORY)
+CREATE TABLE IF NOT EXISTS messages (
+    id TEXT PRIMARY KEY,                           -- UUID
+    ts DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    from_user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    from_nick TEXT NOT NULL,                       -- denormalized for history
+    target TEXT NOT NULL,                          -- #channel name or user UUID for DMs
+    type TEXT NOT NULL DEFAULT 'message',          -- message, action, notice, join, part, quit, topic, mode, nick, system
+    body TEXT NOT NULL DEFAULT '',
+    meta TEXT NOT NULL DEFAULT '{}',               -- JSON extensible metadata
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_messages_target_ts ON messages(target, ts);
+CREATE INDEX IF NOT EXISTS idx_messages_from_user ON messages(from_user_id);
+
+-- Message queue: per-user pending delivery (unread messages)
+CREATE TABLE IF NOT EXISTS message_queue (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    message_id TEXT NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
+    queued_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(user_id, message_id)
+);
+CREATE INDEX IF NOT EXISTS idx_message_queue_user_id ON message_queue(user_id, queued_at);
+
+-- Sessions: server-held session state
+CREATE TABLE IF NOT EXISTS sessions (
+    id TEXT PRIMARY KEY,                           -- UUID
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    last_active_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    expires_at DATETIME                            -- idle timeout
+);
+CREATE INDEX IF NOT EXISTS idx_sessions_user_id ON sessions(user_id);
+
+-- Server links: federation peer configuration
+CREATE TABLE IF NOT EXISTS server_links (
+    id TEXT PRIMARY KEY,                           -- UUID
+    name TEXT NOT NULL UNIQUE,                     -- human-readable peer name
+    url TEXT NOT NULL,                             -- base URL of peer server
+    shared_key_hash TEXT NOT NULL,                 -- hashed shared secret
+    is_active INTEGER NOT NULL DEFAULT 1,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    last_seen_at DATETIME
 );