Changeset 0.23.1 (#154)

server/database/database.go

@@ -17,6 +17,14 @@ import (
 // DB is the application-wide database connection pool.
 var DB *sql.DB
 
+// rawDSN holds the Postgres connection string for LISTEN/NOTIFY consumers.
+// Empty when running SQLite.
+var rawDSN string
+
+// DSN returns the raw Postgres connection string, or "" for SQLite.
+// Used by the event broadcast layer to open a dedicated listener connection.
+func DSN() string { return rawDSN }
+
 // Connect opens a connection pool to the configured database.
 // Driver is selected by DB_DRIVER env var: "postgres" (default) or "sqlite".
 // For SQLite the DATABASE_URL is treated as a file path; ":memory:" is supported.
@@ -45,6 +53,7 @@ func connectPostgres(dsn string) error {
 
 	// Log the database name for operational clarity (never log credentials).
 	dbName = extractDBName(dsn)
+	rawDSN = dsn
 	log.Printf("Connecting to Postgres database %q ...", dbName)
 
 	var err error

server/database/migrations/016_v023_multiuser.sql

@@ -0,0 +1,46 @@
+-- ==========================================
+-- Chat Switchboard — 006 Multi-User: DMs + Channels
+-- ==========================================
+-- Extends channels with 'dm' and 'channel' types, ai_mode, and topic.
+-- Adds presence tracking table.
+-- ICD §3 (Channels & Conversations) — v0.23.1
+-- ==========================================
+
+-- ── Channel type extension ───────────────────────────────────────────
+-- Add 'dm' (human-to-human, AI silent unless @mentioned)
+-- Add 'channel' (named persistent space, configurable ai_mode)
+-- Existing 'direct', 'group', 'workflow' are unchanged.
+ALTER TABLE channels DROP CONSTRAINT IF EXISTS channels_type_check;
+ALTER TABLE channels ADD CONSTRAINT channels_type_check
+    CHECK (type IN ('direct', 'dm', 'group', 'channel', 'workflow'));
+
+-- ── ai_mode ──────────────────────────────────────────────────────────
+-- auto          : AI responds to every message (existing behavior for 'direct')
+-- mention_only  : AI silent unless @mentioned (default for 'dm')
+-- off           : AI disabled entirely
+ALTER TABLE channels
+    ADD COLUMN IF NOT EXISTS ai_mode VARCHAR(20) NOT NULL DEFAULT 'auto'
+        CHECK (ai_mode IN ('auto', 'mention_only', 'off'));
+
+-- Back-fill: DM channels should be mention_only
+-- (No existing rows should have type='dm' yet, but be safe)
+UPDATE channels SET ai_mode = 'mention_only' WHERE type = 'dm' AND ai_mode = 'auto';
+
+-- ── topic ─────────────────────────────────────────────────────────────
+ALTER TABLE channels
+    ADD COLUMN IF NOT EXISTS topic TEXT;
+
+-- ── Presence (in-memory heartbeat, DB stores last_seen for persistence) ──
+-- Not queried at high frequency — updated by heartbeat (30s), read on load.
+CREATE TABLE IF NOT EXISTS user_presence (
+    user_id     UUID PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    last_seen   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    status      VARCHAR(20) NOT NULL DEFAULT 'online'
+                CHECK (status IN ('online', 'away', 'offline'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_presence_last_seen ON user_presence(last_seen DESC);
+
+COMMENT ON TABLE user_presence IS 'Heartbeat-driven presence. Rows upserted every 30s by active clients.';
+COMMENT ON COLUMN channels.ai_mode IS 'auto=respond always, mention_only=@mention required, off=AI disabled';
+COMMENT ON COLUMN channels.topic IS 'Short channel description shown in header';

server/database/migrations/sqlite/016_v023_multiuser.sql

@@ -0,0 +1,23 @@
+-- ==========================================
+-- Chat Switchboard — 006 Multi-User: DMs + Channels (SQLite)
+-- ==========================================
+-- SQLite does not support ALTER CONSTRAINT or DROP CONSTRAINT.
+-- The type check is enforced by application logic for SQLite.
+-- ==========================================
+
+-- ── ai_mode ──────────────────────────────────────────────────────────
+-- SQLite ignores CHECK constraints on existing rows; we add the column
+-- and rely on app-layer validation for the enum values.
+ALTER TABLE channels ADD COLUMN ai_mode TEXT NOT NULL DEFAULT 'auto';
+
+-- ── topic ─────────────────────────────────────────────────────────────
+ALTER TABLE channels ADD COLUMN topic TEXT;
+
+-- ── Presence ──────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS user_presence (
+    user_id     TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    last_seen   DATETIME NOT NULL DEFAULT (datetime('now')),
+    status      TEXT NOT NULL DEFAULT 'online'
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_presence_last_seen ON user_presence(last_seen DESC);