{"type":"excalidraw","version":2,"source":"https://AwesomeSystemDesign.dev","elements":[{"angle":0,"strokeColor":"#6577aa","backgroundColor":"#eef1fc","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-1"}],"updated":0,"link":null,"locked":false,"id":"shape-0","type":"rectangle","seed":41,"x":16,"y":16,"width":288,"height":68,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-1","type":"text","seed":114,"x":36,"y":35.7,"width":248,"height":28.6,"fontSize":22,"fontFamily":1,"text":"Column | Type | Notes","originalText":"Column | Type | Notes","textAlign":"left","verticalAlign":"middle","containerId":"shape-0","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#6577aa","backgroundColor":"#eef1fc","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-2"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-3"}],"updated":0,"link":null,"locked":false,"id":"shape-2","type":"rectangle","seed":187,"x":16,"y":128,"width":288,"height":550.8000000000001,"customData":{"revealStep":2}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-2"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-3","type":"text","seed":260,"x":36,"y":146,"width":248,"height":514.8000000000001,"fontSize":22,"fontFamily":1,"text":"conversation_id |\nUUID | Partition key\nmessage_id |\nTimeUUID |\nClustering key\nsender_id | UUID\nmessage_type |\nENUM | TEXT,\nIMAGE, VIDEO\ncontent | BLOB |\nEncrypted text\nmedia_url | TEXT |\nS3 URL if media\ncreated_at |\nTIMESTAMP\nstatus |\nMAP<UUID,INT>|\n{user_id: status}","originalText":"conversation_id |\nUUID | Partition key\nmessage_id |\nTimeUUID |\nClustering key\nsender_id | UUID\nmessage_type |\nENUM | TEXT,\nIMAGE, VIDEO\ncontent | BLOB |\nEncrypted text\nmedia_url | TEXT |\nS3 URL if media\ncreated_at |\nTIMESTAMP\nstatus |\nMAP<UUID,INT>|\n{user_id: status}","textAlign":"left","verticalAlign":"middle","containerId":"shape-2","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":2}},{"angle":0,"strokeColor":"#a68a53","backgroundColor":"#fff7e6","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-3"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-5"}],"updated":0,"link":null,"locked":false,"id":"shape-4","type":"rectangle","seed":333,"x":16,"y":722.8000000000001,"width":288,"height":751,"customData":{"revealStep":3}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-3"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-5","type":"text","seed":406,"x":36,"y":740.8000000000001,"width":248,"height":715,"fontSize":22,"fontFamily":1,"text":"messages table\n\nPartition Key:\nconversation_id\nClustering Key:\nmessage_id\n(TimeUUID — sorted\nby time)\n\nWhy Cassandra?\n✅ Write-heavy\nworkload (20B\nmessages/day)\n✅ Partition by\nconversation = all\nmessages co-located\n✅ TimeUUID\nclustering =\nmessages sorted by\ntime\n✅ Linear horizontal\nscaling\n✅ Tunable consistency\n(W=1 for speed, R=2\nfor accuracy)","originalText":"messages table\n\nPartition Key:\nconversation_id\nClustering Key:\nmessage_id\n(TimeUUID — sorted\nby time)\n\nWhy Cassandra?\n✅ Write-heavy\nworkload (20B\nmessages/day)\n✅ Partition by\nconversation = all\nmessages co-located\n✅ TimeUUID\nclustering =\nmessages sorted by\ntime\n✅ Linear horizontal\nscaling\n✅ Tunable consistency\n(W=1 for speed, R=2\nfor accuracy)","textAlign":"left","verticalAlign":"middle","containerId":"shape-4","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":3}}],"appState":{"viewBackgroundColor":"#fbfbf8","gridSize":null},"files":{}}