{
  "project": {
    "id": "proj_a3f9c1",
    "title": "Liminal",
    "created_at": "2026-01-14T09:32:00Z",
    "updated_at": "2026-02-25T17:45:12Z",
    "status": "in_progress",
    "bpm": 138,
    "key": "F# minor",
    "time_signature": { "numerator": 4, "denominator": 4 },
    "sample_rate": 44100,
    "bit_depth": 24,
    "tags": ["electronic", "ambient", "club"],
    "notes": "Build drops around the spectral sweep. Keep sub below 60 Hz mono."
  },
  "collaborators": [
    {
      "id": "user_01",
      "name": "YJ",
      "role": "producer",
      "email": "yj@example.com",
      "owner": true
    },
    {
      "id": "user_02",
      "name": "Mara L.",
      "role": "vocalist",
      "email": "mara@example.com",
      "owner": false
    }
  ],
  "stems": [
    {
      "id": "stem_kick",
      "label": "Kick",
      "group": "drums",
      "file": "stems/kick.wav",
      "duration_s": 192.0,
      "peak_dbfs": -3.2,
      "rms_dbfs": -18.5,
      "muted": false,
      "solo": false,
      "color": "#e74c3c"
    },
    {
      "id": "stem_sub",
      "label": "Sub Bass",
      "group": "bass",
      "file": "stems/sub.wav",
      "duration_s": 192.0,
      "peak_dbfs": -4.8,
      "rms_dbfs": -16.2,
      "muted": false,
      "solo": false,
      "color": "#8e44ad"
    },
    {
      "id": "stem_lead",
      "label": "Lead Synth",
      "group": "melodic",
      "file": "stems/lead.wav",
      "duration_s": 192.0,
      "peak_dbfs": -6.1,
      "rms_dbfs": -22.0,
      "muted": false,
      "solo": false,
      "color": "#2980b9"
    },
    {
      "id": "stem_vox",
      "label": "Vocals",
      "group": "melodic",
      "file": "stems/vox.wav",
      "duration_s": 192.0,
      "peak_dbfs": -8.0,
      "rms_dbfs": -24.3,
      "muted": false,
      "solo": false,
      "color": "#27ae60"
    }
  ],
  "spectral_analysis": {
    "run_at": "2026-02-25T17:00:00Z",
    "window_size_s": 1.0,
    "clash_threshold_dbfs": -12.0,
    "min_overlap_ratio": 0.4,
    "clashes": [
      {
        "stem_a": "stem_kick",
        "stem_b": "stem_sub",
        "frequency_hz": 58.0,
        "overlap_ratio": 0.72,
        "severity": "high"
      },
      {
        "stem_a": "stem_lead",
        "stem_b": "stem_vox",
        "frequency_hz": 2400.0,
        "overlap_ratio": 0.44,
        "severity": "low"
      }
    ]
  },
  "arrangement": {
    "total_bars": 128,
    "sections": [
      { "name": "Intro",   "start_bar": 1,   "end_bar": 16  },
      { "name": "Build",   "start_bar": 17,  "end_bar": 32  },
      { "name": "Drop 1",  "start_bar": 33,  "end_bar": 64  },
      { "name": "Break",   "start_bar": 65,  "end_bar": 80  },
      { "name": "Drop 2",  "start_bar": 81,  "end_bar": 112 },
      { "name": "Outro",   "start_bar": 113, "end_bar": 128 }
    ]
  },
  "export_history": [
    {
      "version": 1,
      "exported_at": "2026-02-10T14:22:00Z",
      "format": "wav",
      "lufs_integrated": -14.0,
      "true_peak_dbfs": -1.0,
      "label": "First rough bounce"
    },
    {
      "version": 2,
      "exported_at": "2026-02-25T17:45:00Z",
      "format": "wav",
      "lufs_integrated": -10.5,
      "true_peak_dbfs": -0.3,
      "label": "Club master — pre-feedback"
    }
  ]
}