Fix: Prevent OBD signal merging, preserve distinct metrics, and cache definitions

[tzebrowski]

Overview

This PR fixes a critical data parsing bug where distinct telemetry signals (e.g., "Boost Target" and "Boost Measured") were being incorrectly merged into a single generic chart series (e.g., "Boost"). It also introduces a caching layer to improve application load times.

What Changed

• Fixed Signal Squashing: Updated SignalRegistry.#mergeMetadata to preserve the full, exact English descriptions from the OBD JSON files by replacing newlines with spaces (instead of splitting and truncating).
• Removed Greedy Regex: Removed the aggressive substring matching in SignalRegistry.getCanonicalKey() that was causing the UI to collapse specific names back into generic buckets.
• Refactored DataProcessor: Removed all temporary monkey-patches, hardcoded language checks, and collision workarounds from DataProcessor.#normalizeColumnarJSON. It now cleanly maps PIDs directly to their specific English translations.
• Performance / Caching: Added a 7-day localStorage cache (TTL) to SignalRegistry.init() so the app no longer downloads the large definition dictionaries on every single page load.

[github-actions]

Coverage after merging feat/rework-signals-importing into main will be

89.95%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
alert.js	95.65%	88.89%	100%	100%	19
analysis.js	89.86%	80.65%	85.29%	96.40%	114, 124, 137, 15, 18, 187, 216–217, 22, 229, 23, 32, 39, 47, 90, 94
bus.js	94.59%	75%	100%	100%	36, 39
chartmanager.js	76.72%	62.66%	81.61%	84.38%	1022–1023, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1027–1028, 103, 1034–1035, 1038–1039, 1041–1042, 1044–1045, 1048–1049, 1051, 1054, 1074–1075, 108, 1081–1082, 1082, 1082–1084, 109, 1097, 1108, 1129, 1150, 1184–1185, 119, 157–158, 168, 172, 175–176, 182–185, 185, 185–186, 186, 186–187, 220, 226, 278, 281, 286, 289, 293, 303–304, 304, 308, 347, 354, 362, 362–364, 38, 391, 554, 559, 563, 578, 582, 59, 601–604, 606, 613, 624, 63, 632–633, 642, 647, 65, 656, 66, 663, 668, 68, 68, 68, 682–683, 683, 683–684, 684, 684, 686, 69–70, 703, 705, 71, 73, 736, 738, 74, 74, 74–76, 76, 76, 766, 769, 77, 77, 796–797, 80–83, 837, 840, 843, 845–846, 858, 86, 861, 863–865, 874–875, 888–889, 89, 894, 90, 90, 90, 909, 91, 910, 910, 910, 913–914, 914, 914–915, 918, 918, 92, 92, 92, 92, 92, 920, 928–929, 929, 929, 93, 930, 933–934, 934, 934–935, 938, 938, 94, 940, 949, 95, 959, 96, 960–961, 967, 978–979
config.js	77.78%	100%	0%	83.33%	35
dataprocessor.js	88.11%	79.20%	91.67%	93.85%	128, 128, 128, 131–132, 135, 168, 170–171, 176, 181–182, 193, 206, 213, 220, 226, 250, 253, 272, 276, 282–283, 289, 294, 301, 304, 310, 38, 62–64, 67, 73–76
dbmanager.js	84.13%	57.50%	85.71%	100%	108–110, 116, 122–124, 132–134, 29, 33, 56–57, 71, 95–96
debounce.js	100%	100%	100%	100%
drive.js	86.81%	74.65%	93.62%	92.98%	126, 137, 143, 162, 194, 203–204, 210–212, 212, 212–213, 217, 224, 224, 224–225, 227, 227, 227, 229–231, 233, 244, 251, 272, 278, 293, 304, 317, 324–325, 335, 345, 348, 355, 361–363, 382, 409, 437, 442, 480, 487, 537, 539, 546, 74–75
histogram.js	85.71%	71.43%	72.73%	96.97%	101, 113, 125, 129, 142, 145, 148, 154, 17, 28, 33, 33, 73, 77
mapmanager.js	79.29%	65.55%	75.76%	89.05%	102, 106, 106, 106–107, 109–110, 110, 110–112, 130–134, 148, 150, 153–155, 19, 208–209, 209, 28, 286–287, 291, 297, 31, 339, 343, 360, 372, 38, 412, 416, 424, 435, 443, 448, 452, 456–457, 46, 461–462, 483, 488–491, 491, 491, 491, 491–492, 495–496, 500, 509, 515, 517, 521, 524, 532, 535, 538–540, 546–547, 547, 547, 547, 547–548, 555, 563, 569, 578, 587, 611, 621, 624, 636, 642, 642, 650, 657, 657–658, 668, 719, 72, 72, 72, 721, 723, 73–74, 77, 83–85, 87, 91, 91, 91–94, 94, 94, 94, 94, 94–96
mathchannels.js	80.88%	70.08%	84.91%	86.25%	100–101, 106, 117, 123, 129–131, 138, 16, 184, 184–185, 188, 197–198, 207, 207, 22, 220, 224, 243–244, 25, 264, 281, 290, 290, 290–295, 297–299, 301, 303, 307, 32, 320, 329, 329, 33, 338–340, 340, 340, 340, 340–343, 347, 363, 369, 372–373, 378, 389, 39, 390, 395, 407, 424, 430–431, 450, 450, 454, 461, 467–471, 482–484, 486–488, 490–494, 497–499, 531, 56, 599, 606, 609, 612, 616, 623, 636–637, 648, 650–651, 67, 670, 688–689, 691, 698, 70, 720, 727, 736–738, 763–765, 77, 80, 800, 81, 827, 84, 842, 853, 857, 857,

[github-actions]

Coverage after merging feat/rework-signals-importing into main will be

89.94%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
alert.js	95.65%	88.89%	100%	100%	19
analysis.js	89.86%	80.65%	85.29%	96.40%	114, 124, 137, 15, 18, 187, 216–217, 22, 229, 23, 32, 39, 47, 90, 94
bus.js	94.59%	75%	100%	100%	36, 39
chartmanager.js	76.72%	62.66%	81.61%	84.38%	1022–1023, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1025, 1027–1028, 103, 1034–1035, 1038–1039, 1041–1042, 1044–1045, 1048–1049, 1051, 1054, 1074–1075, 108, 1081–1082, 1082, 1082–1084, 109, 1097, 1108, 1129, 1150, 1184–1185, 119, 157–158, 168, 172, 175–176, 182–185, 185, 185–186, 186, 186–187, 220, 226, 278, 281, 286, 289, 293, 303–304, 304, 308, 347, 354, 362, 362–364, 38, 391, 554, 559, 563, 578, 582, 59, 601–604, 606, 613, 624, 63, 632–633, 642, 647, 65, 656, 66, 663, 668, 68, 68, 68, 682–683, 683, 683–684, 684, 684, 686, 69–70, 703, 705, 71, 73, 736, 738, 74, 74, 74–76, 76, 76, 766, 769, 77, 77, 796–797, 80–83, 837, 840, 843, 845–846, 858, 86, 861, 863–865, 874–875, 888–889, 89, 894, 90, 90, 90, 909, 91, 910, 910, 910, 913–914, 914, 914–915, 918, 918, 92, 92, 92, 92, 92, 920, 928–929, 929, 929, 93, 930, 933–934, 934, 934–935, 938, 938, 94, 940, 949, 95, 959, 96, 960–961, 967, 978–979
config.js	77.78%	100%	0%	83.33%	35
dataprocessor.js	88.11%	79.20%	91.67%	93.85%	128, 128, 128, 131–132, 135, 168, 170–171, 176, 181–182, 193, 206, 213, 220, 226, 250, 253, 272, 276, 282–283, 289, 294, 301, 304, 310, 38, 62–64, 67, 73–76
dbmanager.js	84.13%	57.50%	85.71%	100%	108–110, 116, 122–124, 132–134, 29, 33, 56–57, 71, 95–96
debounce.js	100%	100%	100%	100%
drive.js	86.81%	74.65%	93.62%	92.98%	126, 137, 143, 162, 194, 203–204, 210–212, 212, 212–213, 217, 224, 224, 224–225, 227, 227, 227, 229–231, 233, 244, 251, 272, 278, 293, 304, 317, 324–325, 335, 345, 348, 355, 361–363, 382, 409, 437, 442, 480, 487, 537, 539, 546, 74–75
histogram.js	85.71%	71.43%	72.73%	96.97%	101, 113, 125, 129, 142, 145, 148, 154, 17, 28, 33, 33, 73, 77
mapmanager.js	79.29%	65.55%	75.76%	89.05%	102, 106, 106, 106–107, 109–110, 110, 110–112, 130–134, 148, 150, 153–155, 19, 208–209, 209, 28, 286–287, 291, 297, 31, 339, 343, 360, 372, 38, 412, 416, 424, 435, 443, 448, 452, 456–457, 46, 461–462, 483, 488–491, 491, 491, 491, 491–492, 495–496, 500, 509, 515, 517, 521, 524, 532, 535, 538–540, 546–547, 547, 547, 547, 547–548, 555, 563, 569, 578, 587, 611, 621, 624, 636, 642, 642, 650, 657, 657–658, 668, 719, 72, 72, 72, 721, 723, 73–74, 77, 83–85, 87, 91, 91, 91–94, 94, 94, 94, 94, 94–96
mathchannels.js	80.88%	70.08%	84.91%	86.25%	100–101, 106, 117, 123, 129–131, 138, 16, 184, 184–185, 188, 197–198, 207, 207, 22, 220, 224, 243–244, 25, 264, 281, 290, 290, 290–295, 297–299, 301, 303, 307, 32, 320, 329, 329, 33, 338–340, 340, 340, 340, 340–343, 347, 363, 369, 372–373, 378, 389, 39, 390, 395, 407, 424, 430–431, 450, 450, 454, 461, 467–471, 482–484, 486–488, 490–494, 497–499, 531, 56, 599, 606, 609, 612, 616, 623, 636–637, 648, 650–651, 67, 670, 688–689, 691, 698, 70, 720, 727, 736–738, 763–765, 77, 80, 800, 81, 827, 84, 842, 853, 857, 857,