architecture docs

docs/architecture/02-data-model.dot

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+digraph data_model {
+    rankdir=LR
+    node [shape=record, fontname="Helvetica", fontsize=11]
+    edge [fontname="Helvetica", fontsize=10]
+
+    labelloc="t"
+    label="MPR - Data Model"
+    fontsize=16
+    fontname="Helvetica-Bold"
+
+    graph [splines=ortho, nodesep=0.6, ranksep=1.2]
+
+    MediaAsset [label="{MediaAsset|id: UUID (PK)\lfilename: str\lfile_path: str\lfile_size: int?\lstatus: pending/ready/error\lerror_message: str?\l|duration: float?\lvideo_codec: str?\laudio_codec: str?\lwidth: int?\lheight: int?\lframerate: float?\lbitrate: int?\lproperties: JSON\l|comments: str\ltags: JSON[]\l|created_at: datetime\lupdated_at: datetime\l}"]
+
+    TranscodePreset [label="{TranscodePreset|id: UUID (PK)\lname: str (unique)\ldescription: str\lis_builtin: bool\l|container: str\l|video_codec: str\lvideo_bitrate: str?\lvideo_crf: int?\lvideo_preset: str?\lresolution: str?\lframerate: float?\l|audio_codec: str\laudio_bitrate: str?\laudio_channels: int?\laudio_samplerate: int?\l|extra_args: JSON[]\l|created_at: datetime\lupdated_at: datetime\l}"]
+
+    TranscodeJob [label="{TranscodeJob|id: UUID (PK)\l|source_asset_id: UUID (FK)\l|preset_id: UUID? (FK)\lpreset_snapshot: JSON\l|trim_start: float?\ltrim_end: float?\l|output_filename: str\loutput_path: str?\loutput_asset_id: UUID? (FK)\l|status: pending/processing/...\lprogress: float (0-100)\lcurrent_frame: int?\lcurrent_time: float?\lspeed: str?\lerror_message: str?\l|celery_task_id: str?\lpriority: int\l|created_at: datetime\lstarted_at: datetime?\lcompleted_at: datetime?\l}"]
+
+    MediaAsset -> TranscodeJob [label="1:N source_asset"]
+    TranscodePreset -> TranscodeJob [label="1:N preset"]
+    TranscodeJob -> MediaAsset [label="1:1 output_asset", style=dashed]
+}