chore: merge Rust backend into monorepo

git-subtree-dir: server
git-subtree-mainline: fb6a84d75f
git-subtree-split: 8a88706ff9

server/migrations/0002_voice_feedback_sessions.sql

@@ -0,0 +1,57 @@
+CREATE TABLE feedback_sessions (
+  id UUID PRIMARY KEY,
+  owner_id UUID NOT NULL,
+  profile_id UUID REFERENCES student_profiles(id) ON DELETE CASCADE,
+  feedback_date DATE NOT NULL,
+  content TEXT NOT NULL DEFAULT '',
+  status VARCHAR(16) NOT NULL DEFAULT 'active'
+    CHECK (status IN ('active', 'finalized')),
+  finalized_record_id UUID REFERENCES feedback_records(id) ON DELETE SET NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX feedback_sessions_owner_status_idx
+  ON feedback_sessions (owner_id, status, updated_at DESC);
+
+CREATE UNIQUE INDEX feedback_sessions_one_active_idx
+  ON feedback_sessions (owner_id, COALESCE(profile_id, '00000000-0000-0000-0000-000000000000'::UUID))
+  WHERE status = 'active';
+
+CREATE TABLE lesson_sessions (
+  id UUID PRIMARY KEY,
+  feedback_session_id UUID NOT NULL REFERENCES feedback_sessions(id) ON DELETE CASCADE,
+  sequence INTEGER NOT NULL CHECK (sequence > 0),
+  status VARCHAR(16) NOT NULL DEFAULT 'recording'
+    CHECK (status IN ('recording', 'processing', 'ready', 'failed')),
+  duration_ms INTEGER NOT NULL DEFAULT 0 CHECK (duration_ms >= 0),
+  applied_directly BOOLEAN NOT NULL DEFAULT FALSE,
+  included_in_generation BOOLEAN NOT NULL DEFAULT FALSE,
+  started_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  ended_at TIMESTAMPTZ,
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (feedback_session_id, sequence)
+);
+
+CREATE INDEX lesson_sessions_feedback_session_idx
+  ON lesson_sessions (feedback_session_id, sequence);
+
+CREATE TABLE audio_segments (
+  id UUID PRIMARY KEY,
+  lesson_session_id UUID NOT NULL REFERENCES lesson_sessions(id) ON DELETE CASCADE,
+  sequence INTEGER NOT NULL CHECK (sequence > 0),
+  duration_ms INTEGER NOT NULL CHECK (duration_ms > 0),
+  audio_format VARCHAR(8) NOT NULL,
+  audio_path TEXT NOT NULL,
+  status VARCHAR(16) NOT NULL DEFAULT 'processing'
+    CHECK (status IN ('processing', 'ready', 'failed')),
+  transcript TEXT,
+  error_message TEXT,
+  provider_request_id VARCHAR(100),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (lesson_session_id, sequence)
+);
+
+CREATE INDEX audio_segments_lesson_session_idx
+  ON audio_segments (lesson_session_id, sequence);