Remove recordings feature, replay sessions directly, bump to 0.6.0

Recordings were just a thin named pointer over an already-captured
session's events, so the whole separate feature (recordings table, API
routes, pages, UI) is gone: any completed session can now be named and
replayed directly. Replaying no longer creates a session or duplicates
events of its own - it just bumps the source session's playCount/lastPlayedAt.

Also renames play_sessions/playSession(s) to sessions/session(s) throughout
the schema, queries, API routes, and UI for consistency, and updates the
README to match the new flow.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/db/queries/stats.ts

@@ -1,26 +1,19 @@
 import { sql, eq, and, ne } from "drizzle-orm";
 import { db } from "@/lib/db/client";
-import { playSessions, sessionDevices, sessionEvents, devices, recordings } from "@/lib/db/schema";
+import { sessions, sessionDevices, sessionEvents, devices } from "@/lib/db/schema";
 
 export async function getSessionsSummary() {
   const [totals] = await db
     .select({
       count: sql<number>`count(*)`,
-      totalDurationMs: sql<number>`coalesce(sum(${playSessions.durationMs}), 0)`,
-      avgDurationMs: sql<number>`coalesce(avg(${playSessions.durationMs}), 0)`,
+      totalDurationMs: sql<number>`coalesce(sum(${sessions.durationMs}), 0)`,
+      avgDurationMs: sql<number>`coalesce(avg(${sessions.durationMs}), 0)`,
+      // How many times sessions have been replayed - replaying itself creates no
+      // session of its own, it just bumps the source session's playCount.
+      totalReplays: sql<number>`coalesce(sum(${sessions.playCount}), 0)`,
     })
-    .from(playSessions)
-    .where(eq(playSessions.status, "completed"));
-
-  const byKind = await db
-    .select({
-      kind: playSessions.kind,
-      count: sql<number>`count(*)`,
-      totalDurationMs: sql<number>`coalesce(sum(${playSessions.durationMs}), 0)`,
-    })
-    .from(playSessions)
-    .where(eq(playSessions.status, "completed"))
-    .groupBy(playSessions.kind);
+    .from(sessions)
+    .where(eq(sessions.status, "completed"));
 
   const durationPerDevice = await db
     .select({
@@ -33,10 +26,10 @@ export async function getSessionsSummary() {
     .innerJoin(devices, eq(sessionDevices.deviceId, devices.id))
     .groupBy(devices.id);
 
-  return { ...totals, byKind, durationPerDevice };
+  return { ...totals, durationPerDevice };
 }
 
-export async function getSessionTimeline(playSessionId: number, bucketMs = 1000) {
+export async function getSessionTimeline(sessionId: number, bucketMs = 1000) {
   // Reuse the same expression object (not a `sql`bucket`` alias reference)
   // in groupBy/orderBy - drizzle doesn't emit a literal `AS bucket` that
   // SQLite's GROUP BY/ORDER BY could resolve a bare "bucket" identifier
@@ -53,7 +46,7 @@ export async function getSessionTimeline(playSessionId: number, bucketMs = 1000)
     })
     .from(sessionEvents)
     .innerJoin(sessionDevices, eq(sessionEvents.sessionDeviceId, sessionDevices.id))
-    .where(and(eq(sessionEvents.playSessionId, playSessionId), ne(sessionEvents.commandType, "stop")))
+    .where(and(eq(sessionEvents.sessionId, sessionId), ne(sessionEvents.commandType, "stop")))
     .groupBy(bucket, sessionEvents.sessionDeviceId)
     .orderBy(bucket);
 }
@@ -64,7 +57,7 @@ export async function getDeviceUsageStats() {
       deviceId: devices.id,
       displayName: devices.displayName,
       bleName: devices.bleName,
-      sessionCount: sql<number>`count(distinct ${sessionDevices.playSessionId})`,
+      sessionCount: sql<number>`count(distinct ${sessionDevices.sessionId})`,
       totalActiveMs: sql<number>`coalesce(sum(coalesce(${sessionDevices.disconnectedAt}, ${sessionDevices.connectedAt}) - ${sessionDevices.connectedAt}), 0)`,
       lastUsedAt: sql<number | null>`max(${sessionDevices.connectedAt})`,
     })
@@ -84,26 +77,3 @@ export async function getDeviceCommandCounts() {
     .leftJoin(sessionEvents, eq(sessionEvents.sessionDeviceId, sessionDevices.id))
     .groupBy(devices.id);
 }
-
-export async function getRecordingLibraryStats() {
-  const [totals] = await db
-    .select({
-      count: sql<number>`count(*)`,
-      avgDurationMs: sql<number>`coalesce(avg(${recordings.durationMs}), 0)`,
-      totalPlayCount: sql<number>`coalesce(sum(${recordings.playCount}), 0)`,
-    })
-    .from(recordings);
-
-  const list = await db
-    .select({
-      id: recordings.id,
-      name: recordings.name,
-      durationMs: recordings.durationMs,
-      playCount: recordings.playCount,
-      lastPlayedAt: recordings.lastPlayedAt,
-    })
-    .from(recordings)
-    .orderBy(sql`${recordings.playCount} desc`);
-
-  return { ...totals, list };
-}