showing previous version schedule as faded

backend/app.py

@@ -406,6 +406,7 @@ def compile_schedule_endpoint(request: CompileScheduleRequest) -> dict[str, Any]
 	top_priority_pairs: set[tuple[str, str]] = set()
 	dut_top_priority_ids = {item.strip() for item in request.top_priority_tests_dut if item.strip()}
 	ref_top_priority_ids = {item.strip() for item in request.top_priority_tests_ref if item.strip()}
+	status_lookup = {(test.test_id, test.device): test.status for test in stored_tests}
 
 	# Backward compatibility: if only legacy top_priority_tests was sent,
 	# keep previous behavior by applying IDs to whichever device has that test.
@@ -445,7 +446,17 @@ def compile_schedule_endpoint(request: CompileScheduleRequest) -> dict[str, Any]
 		raise HTTPException(status_code=409, detail=schedule_error)
 
 	version = db.create_schedule_version(
-		[(e.test_id, e.device, e.scheduled_date, e.shift_index, e.sequence_in_shift) for e in entries],
+		[
+			(
+				e.test_id,
+				e.device,
+				e.scheduled_date,
+				e.shift_index,
+				e.sequence_in_shift,
+				status_lookup.get((e.test_id, e.device), "pending"),
+			)
+			for e in entries
+		],
 		DB_PATH,
 	)
 	print(f"Schedule version {version} created with {len(entries)} entries, completion date: {completion_date}")
@@ -506,10 +517,17 @@ def get_schedule_week(start: str | None = None, version: int | None = None) -> d
 	
 	all_rows = db.get_schedule_rows(selected_version, DB_PATH)
 	completion_date = max((row.scheduled_date for row in all_rows), default=None)
+	start_shift = min(
+		((row.scheduled_date, row.shift_index) for row in all_rows),
+		default=(None, None),
+	)
+	schedule_start_date, schedule_start_shift_index = start_shift
 	holiday_dates = db.list_holidays(DB_PATH)
 	return {
 		"start_date": week_start,
 		"schedule_version": selected_version,
+		"schedule_start_date": schedule_start_date,
+		"schedule_start_shift_index": schedule_start_shift_index,
 		"items": [_serialize_schedule_row(row) for row in rows],
 		"total_scheduled_tests": len(all_rows),
 		"completion_date": completion_date,

backend/data/One_Week_Test_Plan_For_Mia.csv

@@ -12,9 +12,11 @@ P1,5,No,No,R3,P2PRXBE008,5G,LPI,T1B,161,80,-67,UL,STA63,,,,,,,,,,,,,85,P2P Only,
 P1,5,No,No,R3,P2PRXBE009,5G,LPI,T1C,161,80,-45,UL,STA63,,,,,,,,,,,,,85,P2P Only,,
 P2,6,Yes,Yes,R3,COERXBE003,5G,LPI,T1F,161,80,-76,UL,STA63,T2A,5,160,-79,DL,STA56,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,
 P2,7,Yes,Yes,R3,COERXBE004,5G,LPI,T1F,161,80,-76,UL,STA63,T2A,133,160,-79,DL,STA56,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,
+P2,9,Yes,Yes,R3,COERXBE006,5G,LPI,T1F,161,80,-76,UL,STA63,T2A,133,320,-79,DL,STA64,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,10,No,Yes,R3,P2PRXBE010,5G,LPI,T1F,100,160,-76,UL,STA63,,,,,,,,,,,,,85,COE Test Case,,
 P1,10,No,No,R3,P2PRXBE011,5G,LPI,T1B,100,160,-67,UL,STA63,,,,,,,,,,,,,85,P2P Only,,
 P1,10,No,No,R3,P2PRXBE012,5G,LPI,T1C,100,160,-45,UL,STA63,,,,,,,,,,,,,85,P2P Only,,
+P2,12,Yes,Yes,R3,COERXBE008,5G,LPI,T1F,100,160,-76,UL,STA63,T2A,133,320,-79,DL,STA64,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,13,No,Yes,R1,P2PRXBE013,6G,LPI,,,,,,,T2A,5,160,-79,UL,STA63,,,,,,,85,COE Test Case,Weekend evening CGW452,Weekend evening CGW453
 P1,13,No,No,R1,P2PRXBE014,6G,LPI,,,,,,,T1B,5,160,-70,UL,STA63,,,,,,,85,P2P Only,Day 2,Day 2
 P1,13,No,No,R1,P2PRXBE015,6G,LPI,,,,,,,T1C,5,160,-45,UL,STA63,,,,,,,85,P2P Only,,
@@ -27,6 +29,10 @@ P1,17,No,Yes,R1,P2PRXBE019,6G,LPI,,,,,,,T2A,197,160,-79,UL,STA63,,,,,,,85,COE Te
 P1,17,No,No,R1,P2PRXBE020,6G,LPI,,,,,,,T1B,197,160,-70,UL,STA63,,,,,,,85,P2P Only,Day 2,Day 2
 P1,17,No,No,R1,P2PRXBE021,6G,LPI,,,,,,,T1C,197,160,-45,UL,STA63,,,,,,,85,P2P Only,,
 P2,18,Yes,Yes,R1,COERXBE011,6G,LPI,T1F,161,80,-76,DL,STA56,T2A,197,160,-79,UL,STA63,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,Weekend evening CGW453
+P1,21,No,Yes,R1,P2PRXBE025,6G,LPI,,,,,,,T2A,133,320,-79,UL,STA63,,,,,,,0,COE Test Case,320BW does not support on device,320BW does not support on device
+P1,21,No,No,R1,P2PRXBE026,6G,LPI,,,,,,,T1B,133,320,-70,UL,STA63,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P1,21,No,No,R1,P2PRXBE027,6G,LPI,,,,,,,T1C,133,320,-45,UL,STA63,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P2,22,Yes,Yes,R1,COERXBE013,6G,LPI,T1F,161,80,-76,DL,STA56,T2A,133,320,-79,UL,STA63,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,23,No,Yes,R2,P2PRXBE028,2G,LPI,,,,,,,,,,,,,T3E,1,20,-70,UL,STA63,85,COE Test Case,,
 P1,23,No,No,R2,P2PRXBE029,2G,LPI,,,,,,,,,,,,,T1D,1,20,-60,UL,STA63,85,P2P Only,,
 P1,23,No,No,R2,P2PRXBE030,2G,LPI,,,,,,,,,,,,,T1C,1,20,-45,UL,STA63,85,P2P Only,,
@@ -55,6 +61,7 @@ P2,7,Yes,Yes,R3,COETXBE004,5G,LPI,T1F,161,80,-76,DL,STA63,T2A,133,160,-79,DL,STA
 P1,8,No,Yes,R3,P2PTXBE010,5G,LPI,T1F,100,160,-76,DL,STA63,,,,,,,,,,,,,85,COE Test Case,,
 P1,8,No,No,R3,P2PTXBE011,5G,LPI,T1B,100,160,-67,DL,STA63,,,,,,,,,,,,,85,P2P Only,,
 P1,8,No,No,R3,P2PTXBE012,5G,LPI,T1C,100,160,-45,DL,STA63,,,,,,,,,,,,,85,P2P Only,,
+P2,10,Yes,Yes,R3,COETXBE006,5G,LPI,T1F,100,160,-76,DL,STA63,T2A,133,320,-79,DL,STA64,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,11,No,Yes,R1,P2PTXBE013,6G,LPI,T2A,5,160,-79,DL,STA63,,,,,,,,,,,,,85,COE Test Case,Weekend evening CGW452,Weekend evening CGW453
 P1,11,No,No,R1,P2PTXBE014,6G,LPI,T1B,5,160,-70,DL,STA63,,,,,,,,,,,,,85,P2P Only,Day 2,Day 2
 P1,11,No,No,R1,P2PTXBE015,6G,LPI,T1C,5,160,-45,DL,STA63,,,,,,,,,,,,,85,P2P Only,Day 1,Day 1
@@ -67,6 +74,10 @@ P1,15,No,Yes,R1,P2PTXBE019,6G,LPI,T2A,197,160,-79,DL,STA63,,,,,,,,,,,,,85,COE Te
 P1,15,No,No,R1,P2PTXBE020,6G,LPI,T1B,197,160,-70,DL,STA63,,,,,,,,,,,,,85,P2P Only,Day 2,Day 2
 P1,15,No,No,R1,P2PTXBE021,6G,LPI,T1C,197,160,-45,DL,STA63,,,,,,,,,,,,,85,P2P Only,Day 1,Day 1
 P2,16,Yes,Yes,R1,COETXBE009,6G,LPI,T1F,161,80,-76,DL,STA56,T2A,197,160,-79,DL,STA63,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,Weekend evening CGW453
+P1,19,No,Yes,R1,P2PTXBE025,6G,LPI,T2A,133,320,-79,DL,STA63,,,,,,,,,,,,,0,COE Test Case,320BW does not support on device,320BW does not support on device
+P1,19,No,No,R1,P2PTXBE026,6G,LPI,T1B,133,320,-70,DL,STA63,,,,,,,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P1,19,No,No,R1,P2PTXBE027,6G,LPI,T1C,133,320,-45,DL,STA63,,,,,,,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P2,20,Yes,Yes,R1,COETXBE011,6G,LPI,T1F,161,80,-76,DL,STA56,T2A,133,320,-79,DL,STA63,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,21,No,Yes,R2,P2PTXBE028,2G,LPI,T3E,1,20,-70,UL,STA63,,,,,,,,,,,,,85,COE Test Case,,
 P1,21,No,No,R2,P2PTXBE029,2G,LPI,T1D,1,20,-60,UL,STA63,,,,,,,,,,,,,85,P2P Only,Day 4,Day 4
 P1,21,No,No,R2,P2PTXBE030,2G,LPI,T1C,1,20,-45,UL,STA63,,,,,,,,,,,,,85,P2P Only,,
@@ -92,9 +103,11 @@ P1,5,No,No,R1,P2PRXAX008,5G,LPI,T1B,161,80,-67,UL,STA56,,,,,,,,,,,,,85,P2P Only,
 P1,5,No,No,R1,P2PRXAX009,5G,LPI,T1C,161,80,-45,UL,STA56,,,,,,,,,,,,,85,P2P Only,Day 2,Day 2
 P2,6,Yes,Yes,R1,COERXAX003,5G,LPI,T1F,161,80,-76,UL,STA56,T2A,5,160,-79,DL,STA63,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,Weekend evening CGW453
 P2,7,Yes,Yes,R1,COERXAX004,5G,LPI,T1F,161,80,-76,UL,STA56,T2A,133,160,-79,DL,STA63,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,Weekend evening CGW453
+P2,9,Yes,Yes,R1,COERXAX006,5G,LPI,T1F,161,80,-76,UL,STA56,T2A,133,320,-79,DL,STA63,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,10,No,Yes,R1,P2PRXAX010,5G,LPI,T1F,100,160,-76,UL,STA56,,,,,,,,,,,,,85,COE Test Case,Weekend evening CGW452,Weekend evening CGW453
 P1,10,No,No,R1,P2PRXAX011,5G,LPI,T1B,100,160,-67,UL,STA56,,,,,,,,,,,,,85,P2P Only,Day 1,Day 1
 P1,10,No,No,R1,P2PRXAX012,5G,LPI,T1C,100,160,-45,UL,STA56,,,,,,,,,,,,,85,P2P Only,Day 2,Day 2
+P2,12,Yes,Yes,R1,COERXAX008,5G,LPI,T1F,100,160,-76,UL,STA56,T2A,133,320,-79,DL,STA63,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,13,No,Yes,R2,P2PRXAX013,6G,LPI,,,,,,,T2A,5,160,-79,UL,STA56,,,,,,,85,COE Test Case,,
 P1,13,No,No,R2,P2PRXAX014,6G,LPI,,,,,,,T1B,5,160,-70,UL,STA56,,,,,,,85,P2P Only,,
 P1,13,No,No,R2,P2PRXAX015,6G,LPI,,,,,,,T1C,5,160,-45,UL,STA56,,,,,,,85,P2P Only,,
@@ -107,6 +120,10 @@ P1,17,No,Yes,R2,P2PRXAX019,6G,LPI,,,,,,,T2A,197,160,-79,UL,STA56,,,,,,,85,COE Te
 P1,17,No,No,R2,P2PRXAX020,6G,LPI,,,,,,,T1B,197,160,-70,UL,STA56,,,,,,,85,P2P Only,,
 P1,17,No,No,R2,P2PRXAX021,6G,LPI,,,,,,,T1C,197,160,-45,UL,STA56,,,,,,,85,P2P Only,,
 P2,18,Yes,Yes,R2,COERXAX011,6G,LPI,T1F,161,80,-76,DL,STA63,T2A,197,160,-79,UL,STA56,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,
+P1,21,No,Yes,R2,P2PRXAX025,6G,LPI,,,,,,,T2A,133,320,-79,UL,STA56,,,,,,,0,COE Test Case,320BW does not support on device,320BW does not support on device
+P1,21,No,No,R2,P2PRXAX026,6G,LPI,,,,,,,T1B,133,320,-70,UL,STA56,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P1,21,No,No,R2,P2PRXAX027,6G,LPI,,,,,,,T1C,133,320,-45,UL,STA56,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P2,22,Yes,Yes,R2,COERXAX013,6G,LPI,T1F,161,80,-76,DL,STA63,T2A,133,320,-79,UL,STA56,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,23,No,Yes,R3,P2PRXAX028,2G,LPI,,,,,,,,,,,,,T3E,1,20,-70,UL,STA56,85,COE Test Case,,
 P1,23,No,No,R3,P2PRXAX029,2G,LPI,,,,,,,,,,,,,T1D,1,20,-60,UL,STA56,85,P2P Only,,
 P1,23,No,No,R3,P2PRXAX030,2G,LPI,,,,,,,,,,,,,T1C,1,20,-45,UL,STA56,85,P2P Only,,
@@ -135,6 +152,7 @@ P2,7,Yes,Yes,R1,COETXAX004,5G,LPI,T1F,161,80,-76,DL,STA56,T2A,133,160,-79,DL,STA
 P1,8,No,Yes,R1,P2PTXAX010,5G,LPI,T1F,100,160,-76,DL,STA56,,,,,,,,,,,,,85,COE Test Case,Weekend evening CGW452,Weekend evening CGW453
 P1,8,No,No,R1,P2PTXAX011,5G,LPI,T1B,100,160,-67,DL,STA56,,,,,,,,,,,,,85,P2P Only,Day 1,Day 1
 P1,8,No,No,R1,P2PTXAX012,5G,LPI,T1C,100,160,-45,DL,STA56,,,,,,,,,,,,,85,P2P Only,Day 3,Day 3
+P2,10,Yes,Yes,R1,COETXAX006,5G,LPI,T1F,100,160,-76,DL,STA56,T2A,133,320,-79,DL,STA63,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,11,No,Yes,R2,P2PTXAX013,6G,LPI,,,,,,,T2A,5,160,-79,DL,STA56,,,,,,,85,COE Test Case,,
 P1,11,No,No,R2,P2PTXAX014,6G,LPI,,,,,,,T1B,5,160,-70,DL,STA56,,,,,,,85,P2P Only,,
 P1,11,No,No,R2,P2PTXAX015,6G,LPI,,,,,,,T1C,5,160,-45,DL,STA56,,,,,,,85,P2P Only,,
@@ -147,6 +165,10 @@ P1,15,No,Yes,R2,P2PTXAX019,6G,LPI,,,,,,,T2A,197,160,-79,DL,STA56,,,,,,,85,COE Te
 P1,15,No,No,R2,P2PTXAX020,6G,LPI,,,,,,,T1B,197,160,-70,DL,STA56,,,,,,,85,P2P Only,,
 P1,15,No,No,R2,P2PTXAX021,6G,LPI,,,,,,,T1C,197,160,-45,DL,STA56,,,,,,,85,P2P Only,,
 P2,16,Yes,Yes,R2,COETXAX009,6G,LPI,T1F,161,80,-76,DL,STA63,T2A,197,160,-79,DL,STA56,T3E,6,20,-70,DL,STA4,144,COE Test Case,COE test case. No plan to run,
+P1,19,No,Yes,R2,P2PTXAX025,6G,LPI,,,,,,,T2A,133,320,-79,DL,STA56,,,,,,,0,COE Test Case,320BW does not support on device,320BW does not support on device
+P1,19,No,No,R2,P2PTXAX026,6G,LPI,,,,,,,T1B,133,320,-70,DL,STA56,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P1,19,No,No,R2,P2PTXAX027,6G,LPI,,,,,,,T1C,133,320,-45,DL,STA56,,,,,,,0,P2P Only,320BW does not support on device,320BW does not support on device
+P2,20,Yes,Yes,R2,COETXAX011,6G,LPI,T1F,161,80,-76,DL,STA63,T2A,133,320,-79,DL,STA56,T3E,6,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device
 P1,21,No,Yes,R3,P2PTXAX028,2G,LPI,,,,,,,,,,,,,T3E,1,20,-70,UL,STA56,85,COE Test Case,,
 P1,21,No,No,R3,P2PTXAX029,2G,LPI,,,,,,,,,,,,,T1D,1,20,-60,UL,STA56,85,P2P Only,,
 P1,21,No,No,R3,P2PTXAX030,2G,LPI,,,,,,,,,,,,,T1C,1,20,-45,UL,STA56,85,P2P Only,,
@@ -204,3 +226,4 @@ P2,17,Yes,Yes,R1,COETXAC004,2G,LPI,T1F,36,80,-76,DL,STA56,T2A,133,160,OFF,DL,STA
 P1,18,No,Yes,R1,P2PTXAC016,2G,LPI,,,,,,,,,,,,,T3E,11,20,-70,DL,STA4,85,COE Test Case,Weekend evening CGW452,
 P1,18,No,No,R1,P2PTXAC017,2G,LPI,,,,,,,,,,,,,T1D,11,20,-60,DL,STA4,85,P2P Only,Day 3,Day 3
 P1,18,No,No,R1,P2PTXAC018,2G,LPI,,,,,,,,,,,,,T1C,11,20,-45,DL,STA4,85,P2P Only,Day 4,Day 4
+P2,19,Yes,Yes,R1,COETXAC005,2G,LPI,T1F,36,80,-76,DL,STA56,T2A,5,320,OFF,DL,STA63,T3E,11,20,-70,DL,STA4,0,COE Test Case,320BW does not support on device,320BW does not support on device

backend/db.py

@@ -19,6 +19,7 @@ REF = os.getenv("REF", "CGW452").strip()
 # Device names for the test database (use hardware device names)
 DEVICE_DUT = DUT
 DEVICE_REF = REF 
+MAX_SCHEDULE_VERSIONS = 50
 
 @dataclass(frozen=True)
 class TestRecord:
@@ -139,6 +140,20 @@ def init_db(db_path: str | Path = DB_PATH) -> None:
 		_ensure_column(conn, "tests", "excluded", "INTEGER NOT NULL DEFAULT 0")
 		_ensure_column(conn, "tests", "throttled", "INTEGER NOT NULL DEFAULT 0")
 		_ensure_column(conn, "tests", "station_testpoint_map", "TEXT")
+		_ensure_column(conn, "schedules", "status_snapshot", "TEXT")
+		conn.execute(
+			"""
+			UPDATE schedules
+			SET status_snapshot = COALESCE((
+				SELECT t.status
+				FROM tests t
+				WHERE t.test_id = schedules.test_id
+				  AND t.device = schedules.device
+			), 'pending')
+			WHERE status_snapshot IS NULL
+			"""
+		)
+		prune_schedule_versions(conn=conn)
 
 		# Seed runtime defaults for schedule estimation.
 		conn.execute(
@@ -454,7 +469,7 @@ def list_holidays(db_path: str | Path = DB_PATH) -> set[str]:
 
 
 def create_schedule_version(
-	entries: list[tuple[str, str, str, int, int]],
+	entries: list[tuple[str, str, str, int, int, str]],
 	db_path: str | Path = DB_PATH,
 ) -> int:
 	with get_connection(db_path) as conn:
@@ -464,18 +479,102 @@ def create_schedule_version(
 		if entries:
 			conn.executemany(
 				"""
-				INSERT INTO schedules(schedule_version, test_id, device, scheduled_date, shift_index, sequence_in_shift)
+				INSERT INTO schedules(
-				VALUES (?, ?, ?, ?, ?, ?)
+					schedule_version,
+					test_id,
+					device,
+					scheduled_date,
+					shift_index,
+					sequence_in_shift,
+					status_snapshot
+				)
+				VALUES (?, ?, ?, ?, ?, ?, ?)
 				""",
 				[
-					(next_version, test_id, device, scheduled_date, shift_index, sequence)
+					(next_version, test_id, device, scheduled_date, shift_index, sequence, status_snapshot)
-					for test_id, device, scheduled_date, shift_index, sequence in entries
+					for test_id, device, scheduled_date, shift_index, sequence, status_snapshot in entries
 				],
 			)
 
+		prune_schedule_versions(conn=conn)
+
 	return next_version
 
 
+def prune_schedule_versions(
+	max_versions: int = MAX_SCHEDULE_VERSIONS,
+	db_path: str | Path = DB_PATH,
+	conn: sqlite3.Connection | None = None,
+) -> int:
+	if max_versions <= 0:
+		raise ValueError("max_versions must be positive")
+
+	def _prune(active_conn: sqlite3.Connection) -> int:
+		cursor = active_conn.execute(
+			"""
+			DELETE FROM schedules
+			WHERE schedule_version IN (
+				SELECT schedule_version
+				FROM (
+					SELECT schedule_version
+					FROM schedules
+					GROUP BY schedule_version
+					ORDER BY schedule_version DESC
+					LIMIT -1 OFFSET ?
+				)
+			)
+			""",
+			(max_versions,),
+		)
+		return cursor.rowcount
+
+	if conn is not None:
+		return _prune(conn)
+
+	with get_connection(db_path) as active_conn:
+		return _prune(active_conn)
+
+
+def _resolve_requested_schedule_version(
+	conn: sqlite3.Connection,
+	version: int | None,
+) -> tuple[int | None, int | None]:
+	latest_row = conn.execute("SELECT MAX(schedule_version) AS latest FROM schedules").fetchone()
+	latest = latest_row["latest"]
+	latest_version = int(latest) if latest is not None else None
+
+	if version is not None:
+		row = conn.execute(
+			"SELECT 1 AS exists_row FROM schedules WHERE schedule_version = ? LIMIT 1",
+			(version,),
+		).fetchone()
+		return (int(version) if row else None, latest_version)
+
+	return latest_version, latest_version
+
+
+def _hydrate_schedule_rows(rows: list[sqlite3.Row]) -> list[ScheduleRow]:
+	result: list[ScheduleRow] = []
+	for row in rows:
+		result.append(
+			ScheduleRow(
+				test_id=row["test_id"],
+				device=row["device"],
+				scheduled_date=row["scheduled_date"],
+				shift_index=int(row["shift_index"]),
+				sequence_in_shift=int(row["sequence_in_shift"]),
+				test_type=row["test_type"],
+				rotation=row["rotation"],
+				config=json.loads(row["config_json"] or "{}"),
+				status=row["status"],
+				priority=int(row["priority"]),
+				estimated_minutes=int(row["estimated_minutes"]),
+			)
+		)
+
+	return result
+
+
 def get_schedule_versions(db_path: str | Path = DB_PATH) -> list[dict[str, Any]]:
 	with get_connection(db_path) as conn:
 		rows = conn.execute(
@@ -505,16 +604,8 @@ def resolve_schedule_version(
 	db_path: str | Path = DB_PATH,
 ) -> int | None:
 	with get_connection(db_path) as conn:
-		if version is not None:
+		selected_version, _latest_version = _resolve_requested_schedule_version(conn, version)
-			row = conn.execute(
+		return selected_version
-				"SELECT 1 FROM schedules WHERE schedule_version = ? LIMIT 1",
-				(version,),
-			).fetchone()
-			return int(version) if row else None
-
-		latest_row = conn.execute("SELECT MAX(schedule_version) AS latest FROM schedules").fetchone()
-		latest = latest_row["latest"]
-		return int(latest) if latest is not None else None
 
 
 def get_schedule_week(
@@ -523,26 +614,15 @@ def get_schedule_week(
 	db_path: str | Path = DB_PATH,
 ) -> list[ScheduleRow]:
 	with get_connection(db_path) as conn:
-		if version is not None:
+		selected_version, latest_version = _resolve_requested_schedule_version(conn, version)
-			version_row = conn.execute(
-				"SELECT 1 AS exists_row FROM schedules WHERE schedule_version = ? LIMIT 1",
-				(version,),
-			).fetchone()
-			if version_row is None:
-				return []
-			selected_version = int(version)
-		else:
-			latest_row = conn.execute("SELECT MAX(schedule_version) AS latest FROM schedules").fetchone()
-			latest = latest_row["latest"]
-			if latest is None:
-				return []
-			selected_version = int(latest)
-
 		if selected_version is None:
 			return []
 
+		use_live_status = latest_version is not None and selected_version == latest_version
+		status_sql = "COALESCE(t.status, s.status_snapshot, 'pending')" if use_live_status else "COALESCE(s.status_snapshot, 'pending')"
+
 		rows = conn.execute(
-			"""
+			f"""
 			SELECT
 				s.test_id,
 				s.device,
@@ -552,7 +632,7 @@ def get_schedule_week(
 				t.test_type,
 				t.rotation,
 				t.config_json,
-				t.status,
+				{status_sql} AS status,
 				t.priority,
 				t.estimated_minutes
 			FROM schedules s
@@ -586,25 +666,7 @@ def get_schedule_week(
 			),
 		).fetchall()
 
-	result: list[ScheduleRow] = []
+	return _hydrate_schedule_rows(rows)
-	for row in rows:
-		result.append(
-			ScheduleRow(
-				test_id=row["test_id"],
-				device=row["device"],
-				scheduled_date=row["scheduled_date"],
-				shift_index=int(row["shift_index"]),
-				sequence_in_shift=int(row["sequence_in_shift"]),
-				test_type=row["test_type"],
-				rotation=row["rotation"],
-				config=json.loads(row["config_json"] or "{}"),
-				status=row["status"],
-				priority=int(row["priority"]),
-				estimated_minutes=int(row["estimated_minutes"]),
-			)
-		)
-
-	return result
 
 
 def get_schedule_rows(
@@ -612,26 +674,15 @@ def get_schedule_rows(
 	db_path: str | Path = DB_PATH,
 ) -> list[ScheduleRow]:
 	with get_connection(db_path) as conn:
-		if version is not None:
+		selected_version, latest_version = _resolve_requested_schedule_version(conn, version)
-			version_row = conn.execute(
-				"SELECT 1 AS exists_row FROM schedules WHERE schedule_version = ? LIMIT 1",
-				(version,),
-			).fetchone()
-			if version_row is None:
-				return []
-			selected_version = int(version)
-		else:
-			latest_row = conn.execute("SELECT MAX(schedule_version) AS latest FROM schedules").fetchone()
-			latest = latest_row["latest"]
-			if latest is None:
-				return []
-			selected_version = int(latest)
-
 		if selected_version is None:
 			return []
 
+		use_live_status = latest_version is not None and selected_version == latest_version
+		status_sql = "COALESCE(t.status, s.status_snapshot, 'pending')" if use_live_status else "COALESCE(s.status_snapshot, 'pending')"
+
 		rows = conn.execute(
-			"""
+			f"""
 			SELECT
 				s.test_id,
 				s.device,
@@ -641,7 +692,7 @@ def get_schedule_rows(
 				t.test_type,
 				t.rotation,
 				t.config_json,
-				t.status,
+				{status_sql} AS status,
 				t.priority,
 				t.estimated_minutes
 			FROM schedules s
@@ -652,25 +703,7 @@ def get_schedule_rows(
 			(selected_version,),
 		).fetchall()
 
-	result: list[ScheduleRow] = []
+	return _hydrate_schedule_rows(rows)
-	for row in rows:
-		result.append(
-			ScheduleRow(
-				test_id=row["test_id"],
-				device=row["device"],
-				scheduled_date=row["scheduled_date"],
-				shift_index=int(row["shift_index"]),
-				sequence_in_shift=int(row["sequence_in_shift"]),
-				test_type=row["test_type"],
-				rotation=row["rotation"],
-				config=json.loads(row["config_json"] or "{}"),
-				status=row["status"],
-				priority=int(row["priority"]),
-				estimated_minutes=int(row["estimated_minutes"]),
-			)
-		)
-
-	return result
 
 def reset_completed_to_pending(db_path: str | Path = DB_PATH) -> int:
 	"""Reset all 'completed' tests back to 'pending'. Used before a full directory rescan."""

frontend/src/App.jsx

@@ -119,6 +119,87 @@ function toTonightConfigRows(scheduleData) {
     .sort((a, b) => a.sta.localeCompare(b.sta))
 }
 
+const SHIFT_KEYS = ['shift1', 'shift2', 'shift3']
+const SHIFT_INDEX_BY_KEY = {
+  shift1: 1,
+  shift2: 2,
+  shift3: 3,
+}
+
+function createEmptyScheduleDay() {
+  return { shift1: [], shift2: [], shift3: [] }
+}
+
+function getShiftTests(scheduleData, dateKey, shiftKey) {
+  return scheduleData[dateKey]?.[shiftKey] ?? []
+}
+
+function isOnOrAfterScheduleStart(dateKey, shiftKey, scheduleStartShift) {
+  if (!scheduleStartShift?.date || !scheduleStartShift?.shiftIndex) return false
+
+  if (dateKey > scheduleStartShift.date) return true
+  if (dateKey < scheduleStartShift.date) return false
+
+  const currentShiftIndex = SHIFT_INDEX_BY_KEY[shiftKey] ?? 99
+  return currentShiftIndex >= scheduleStartShift.shiftIndex
+}
+
+function collectSnapshotShiftKeys(currentScheduleData = {}, previousScheduleData = {}, scheduleStartShift = null) {
+  const snapshotShiftKeys = new Set()
+  const dateKeys = new Set([
+    ...Object.keys(currentScheduleData),
+    ...Object.keys(previousScheduleData),
+  ])
+
+  for (const dateKey of dateKeys) {
+    for (const shiftKey of SHIFT_KEYS) {
+      if (isOnOrAfterScheduleStart(dateKey, shiftKey, scheduleStartShift)) {
+        continue
+      }
+
+      const currentTests = getShiftTests(currentScheduleData, dateKey, shiftKey)
+      const previousTests = getShiftTests(previousScheduleData, dateKey, shiftKey)
+
+      // Show historical snapshot only when this shift disappeared in the latest schedule.
+      if (currentTests.length === 0 && previousTests.length > 0) {
+        snapshotShiftKeys.add(`${dateKey}::${shiftKey}`)
+      }
+    }
+  }
+
+  return snapshotShiftKeys
+}
+
+function markHistoricalSnapshot(tests = []) {
+  return tests.map((test) => ({
+    ...test,
+    isPreviousVersionSnapshot: true,
+  }))
+}
+
+function buildCalendarScheduleData(currentScheduleData = {}, previousScheduleData = {}, snapshotShiftKeys = new Set()) {
+  const calendarScheduleData = {}
+  const dateKeys = new Set([
+    ...Object.keys(currentScheduleData),
+    ...Object.keys(previousScheduleData),
+  ])
+
+  for (const dateKey of dateKeys) {
+    const mergedDay = createEmptyScheduleDay()
+
+    for (const shiftKey of SHIFT_KEYS) {
+      const shiftSnapshotKey = `${dateKey}::${shiftKey}`
+      mergedDay[shiftKey] = snapshotShiftKeys.has(shiftSnapshotKey)
+        ? markHistoricalSnapshot(getShiftTests(previousScheduleData, dateKey, shiftKey))
+        : getShiftTests(currentScheduleData, dateKey, shiftKey)
+    }
+
+    calendarScheduleData[dateKey] = mergedDay
+  }
+
+  return calendarScheduleData
+}
+
 const DEFAULT_SETTINGS = {
   p2pCoeCsvPath:      '',
   p3pCsvPath:         '',
@@ -171,6 +252,8 @@ export default function App() {
   const [startDateOverride, setStartDateOverride] = useState('')
   const [failedTests,       setFailedTests]       = useState([])
   const [scheduleData,      setScheduleData]      = useState({})
+  const [previousScheduleData, setPreviousScheduleData] = useState({})
+  const [scheduleStartShift, setScheduleStartShift] = useState(null)
   const [scheduleWindows,   setScheduleWindows]   = useState([])
   const [selectedWindowId,  setSelectedWindowId]  = useState(null)
   const [completionDate,    setCompletionDate]    = useState(null)
@@ -178,6 +261,14 @@ export default function App() {
   const [loading,           setLoading]           = useState(false)
   const [error,             setError]             = useState(null)
   const tonightConfigRows = useMemo(() => toTonightConfigRows(scheduleData), [scheduleData])
+  const snapshotShiftKeys = useMemo(
+    () => collectSnapshotShiftKeys(scheduleData, previousScheduleData, scheduleStartShift),
+    [scheduleData, previousScheduleData, scheduleStartShift],
+  )
+  const calendarScheduleData = useMemo(
+    () => buildCalendarScheduleData(scheduleData, previousScheduleData, snapshotShiftKeys),
+    [scheduleData, previousScheduleData, snapshotShiftKeys],
+  )
   const windowLookup = useMemo(() => {
     const lookup = new Map()
 
@@ -205,7 +296,27 @@ export default function App() {
   const fetchSchedule = useCallback(async (start) => {
     try {
       const data = await api.getScheduleWeek(toKey(start))
+      let previousVersionScheduleData = {}
+
+      if ((data.schedule_version ?? 0) > 1) {
+        try {
+          const previousData = await api.getScheduleWeek(toKey(start), data.schedule_version - 1)
+          previousVersionScheduleData = groupScheduleItems(previousData.items)
+        } catch (previousError) {
+          console.warn('Failed to fetch previous schedule version:', previousError)
+        }
+      }
+
       setScheduleData(groupScheduleItems(data.items))
+      setPreviousScheduleData(previousVersionScheduleData)
+      if (data.schedule_start_date && data.schedule_start_shift_index) {
+        setScheduleStartShift({
+          date: data.schedule_start_date,
+          shiftIndex: data.schedule_start_shift_index,
+        })
+      } else {
+        setScheduleStartShift(null)
+      }
       setScheduleWindows(data.windows ?? [])
       setCompletionDate(data.completion_date ?? null)
     } catch (e) {
@@ -386,7 +497,7 @@ export default function App() {
       <main className="relative flex flex-1 gap-4 p-4 overflow-hidden">
         <div className="flex-1 min-w-0 flex flex-col">
           <Calendar
-            scheduleData={scheduleData}
+            scheduleData={calendarScheduleData}
             daytimeDateKey={null}
             weekStart={weekStart}
             onWeekChange={setWeekStart}
@@ -398,6 +509,7 @@ export default function App() {
               }))
             }}
             windowLookup={windowLookup}
+            snapshotShiftKeys={snapshotShiftKeys}
             onWindowSelect={handleWindowSelect}
           />
         </div>

frontend/src/api.js

@@ -30,7 +30,13 @@ export const api = {
 
   // Schedule
   compileSchedule: (opts) => request('POST', '/schedule/compile', opts),
-  getScheduleWeek: (start) => request('GET', `/schedule/week?start=${start}`),
+  getScheduleWeek: (start, version = null) => {
+    const params = new URLSearchParams({ start })
+    if (version !== null && version !== undefined) {
+      params.set('version', String(version))
+    }
+    return request('GET', `/schedule/week?${params.toString()}`)
+  },
   getRerunTests: () => request('GET', '/tests/rerun'),
 }
 

frontend/src/components/Calendar.jsx

@@ -57,6 +57,7 @@ export default function Calendar({
   dualDeviceWeekendWeekEnabled = false,
   onDualDeviceWeekendWeekEnabledChange,
   windowLookup = new Map(),
+  snapshotShiftKeys = new Set(),
   onWindowSelect,
 }) {
   const DEFAULT_SHIFT_MIN_ROWS = 3
@@ -226,6 +227,7 @@ export default function Calendar({
                 slotHeights={slotHeights}
                 showShift2={isWeekend || (daytimeDateKey !== null && key === daytimeDateKey)}
                 windowLookup={windowLookup}
+                snapshotShiftKeys={snapshotShiftKeys}
                 onWindowSelect={onWindowSelect}
               />
             )

frontend/src/components/DayColumn.jsx

@@ -13,6 +13,7 @@ export default function DayColumn({
   shiftMinRows = { shift2: 1, shift3: 1, nextDayShift1: 1 },
   slotHeights = { shift2: 0, shift3: 0, nextDayShift1: 0 },
   windowLookup = new Map(),
+  snapshotShiftKeys = new Set(),
   onWindowSelect,
 }) {
   const dayName = DAY_NAMES[date.getDay()]
@@ -20,11 +21,17 @@ export default function DayColumn({
   const dateKey = date.toISOString().slice(0, 10)
   const nextDateKey = new Date(date.getTime() + (24 * 60 * 60 * 1000)).toISOString().slice(0, 10)
 
+  function isSnapshotShift(snapshotDateKey, shiftIndex) {
+    return snapshotShiftKeys.has(`${snapshotDateKey}::shift${shiftIndex}`)
+  }
+
   function getWindowForShift(shiftIndex) {
+    if (isSnapshotShift(dateKey, shiftIndex)) return null
     return windowLookup.get(`${dateKey}::shift${shiftIndex}`) ?? null
   }
 
   function getNextDayShift1Window() {
+    if (isSnapshotShift(nextDateKey, 1)) return null
     return windowLookup.get(`${nextDateKey}::shift1`) ?? null
   }
 

frontend/src/components/TestCard.jsx

@@ -50,6 +50,7 @@ export default function TestCard({ test }) {
   const normalizedStatus = String(test?.status ?? 'pending').trim().toLowerCase()
   const style = STATUS_STYLES[normalizedStatus] ?? STATUS_STYLES.pending
   const deviceAccentClass = getDeviceAccentClass(test.device)
+  const isPreviousVersionSnapshot = Boolean(test?.isPreviousVersionSnapshot)
   const cardRef = useRef(null)
   const [tooltipPos, setTooltipPos] = useState({ top: '0px', left: '0px' })
   const [isHovered, setIsHovered] = useState(false)
@@ -92,7 +93,7 @@ export default function TestCard({ test }) {
     <div ref={cardRef} className="relative">
       <div
         className={`relative px-1.5 py-0.5 pl-3 rounded border text-xs font-mono truncate cursor-default select-none ${style}`}
-        style={{ maxWidth: '100%' }}
+        style={{ maxWidth: '100%', opacity: isPreviousVersionSnapshot ? 0.45 : 1 }}
       >
         <span className={`absolute inset-y-0 left-0 w-1 rounded-l ${deviceAccentClass}`} aria-hidden="true" />
         {test.test_id}