diff --git a/packages/backend/src/core/chart/core.ts b/packages/backend/src/core/chart/core.ts
index 2092b13b7e..d352adcc1f 100644
--- a/packages/backend/src/core/chart/core.ts
+++ b/packages/backend/src/core/chart/core.ts
@@ -11,9 +11,9 @@ import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 import type { Repository, DataSource } from 'typeorm';
 
-const columnPrefix = '___' as const;
-const uniqueTempColumnPrefix = 'unique_temp___' as const;
-const columnDot = '_' as const;
+const COLUMN_PREFIX = '___' as const;
+const UNIQUE_TEMP_COLUMN_PREFIX = 'unique_temp___' as const;
+const COLUMN_DELIMITER = '_' as const;
 
 type Schema = Record<string, {
 	uniqueIncrement?: boolean;
@@ -26,14 +26,14 @@ type Schema = Record<string, {
 	accumulate?: boolean;
 }>;
 
-type KeyToColumnName<T extends string> = T extends `${infer R1}.${infer R2}` ? `${R1}${typeof columnDot}${KeyToColumnName<R2>}` : T;
+type KeyToColumnName<T extends string> = T extends `${infer R1}.${infer R2}` ? `${R1}${typeof COLUMN_DELIMITER}${KeyToColumnName<R2>}` : T;
 
 type Columns<S extends Schema> = {
-	[K in keyof S as `${typeof columnPrefix}${KeyToColumnName<string & K>}`]: number;
+	[K in keyof S as `${typeof COLUMN_PREFIX}${KeyToColumnName<string & K>}`]: number;
 };
 
 type TempColumnsForUnique<S extends Schema> = {
-	[K in keyof S as `${typeof uniqueTempColumnPrefix}${KeyToColumnName<string & K>}`]: S[K]['uniqueIncrement'] extends true ? string[] : never;
+	[K in keyof S as `${typeof UNIQUE_TEMP_COLUMN_PREFIX}${KeyToColumnName<string & K>}`]: S[K]['uniqueIncrement'] extends true ? string[] : never;
 };
 
 type RawRecord<S extends Schema> = {
@@ -138,20 +138,20 @@ export default abstract class Chart<T extends Schema> {
 	private static convertSchemaToColumnDefinitions(schema: Schema): Record<string, { type: string; array?: boolean; default?: any; }> {
 		const columns = {} as Record<string, { type: string; array?: boolean; default?: any; }>;
 		for (const [k, v] of Object.entries(schema)) {
-			const name = k.replaceAll('.', columnDot);
+			const name = k.replaceAll('.', COLUMN_DELIMITER);
 			const type = v.range === 'big' ? 'bigint' : v.range === 'small' ? 'smallint' : 'integer';
 			if (v.uniqueIncrement) {
-				columns[uniqueTempColumnPrefix + name] = {
+				columns[UNIQUE_TEMP_COLUMN_PREFIX + name] = {
 					type: 'varchar',
 					array: true,
 					default: '{}',
 				};
-				columns[columnPrefix + name] = {
+				columns[COLUMN_PREFIX + name] = {
 					type,
 					default: 0,
 				};
 			} else {
-				columns[columnPrefix + name] = {
+				columns[COLUMN_PREFIX + name] = {
 					type,
 					default: 0,
 				};
@@ -253,8 +253,8 @@ export default abstract class Chart<T extends Schema> {
 	@bindThis
 	private convertRawRecord(x: RawRecord<T>): KVs<T> {
 		const kvs = {} as Record<string, number>;
-		for (const k of Object.keys(x).filter((k) => k.startsWith(columnPrefix)) as (keyof Columns<T>)[]) {
-			kvs[(k as string).substr(columnPrefix.length).split(columnDot).join('.')] = x[k] as unknown as number;
+		for (const k of Object.keys(x).filter((k) => k.startsWith(COLUMN_PREFIX)) as (keyof Columns<T>)[]) {
+			kvs[(k as string).substr(COLUMN_PREFIX.length).split(COLUMN_DELIMITER).join('.')] = x[k] as unknown as number;
 		}
 		return kvs as KVs<T>;
 	}
@@ -357,8 +357,8 @@ export default abstract class Chart<T extends Schema> {
 
 			const columns = {} as Record<string, number | unknown[]>;
 			for (const [k, v] of Object.entries(data)) {
-				const name = k.replaceAll('.', columnDot);
-				columns[columnPrefix + name] = v;
+				const name = k.replaceAll('.', COLUMN_DELIMITER);
+				columns[COLUMN_PREFIX + name] = v;
 			}
 
 			// 新規ログ挿入
@@ -419,13 +419,13 @@ export default abstract class Chart<T extends Schema> {
 			const queryForDay: Record<keyof RawRecord<T>, number | (() => string)> = {} as any;
 			for (const [k, v] of Object.entries(finalDiffs)) {
 				if (typeof v === 'number') {
-					const name = columnPrefix + k.replaceAll('.', columnDot) as string & keyof Columns<T>;
+					const name = COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as string & keyof Columns<T>;
 					if (v > 0) queryForHour[name] = () => `"${name}" + ${v}`;
 					if (v < 0) queryForHour[name] = () => `"${name}" - ${Math.abs(v)}`;
 					if (v > 0) queryForDay[name] = () => `"${name}" + ${v}`;
 					if (v < 0) queryForDay[name] = () => `"${name}" - ${Math.abs(v)}`;
 				} else if (Array.isArray(v) && v.length > 0) { // ユニークインクリメント
-					const tempColumnName = uniqueTempColumnPrefix + k.replaceAll('.', columnDot) as string & keyof TempColumnsForUnique<T>;
+					const tempColumnName = UNIQUE_TEMP_COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as string & keyof TempColumnsForUnique<T>;
 					// TODO: item をSQLエスケープ
 					const itemsForHour = v.filter(item => !(logHour[tempColumnName] as unknown as string[]).includes(item)).map(item => `"${item}"`);
 					const itemsForDay = v.filter(item => !(logDay[tempColumnName] as unknown as string[]).includes(item)).map(item => `"${item}"`);
@@ -437,8 +437,8 @@ export default abstract class Chart<T extends Schema> {
 			// bake unique count
 			for (const [k, v] of Object.entries(finalDiffs)) {
 				if (this.schema[k].uniqueIncrement) {
-					const name = columnPrefix + k.replaceAll('.', columnDot) as keyof Columns<T>;
-					const tempColumnName = uniqueTempColumnPrefix + k.replaceAll('.', columnDot) as keyof TempColumnsForUnique<T>;
+					const name = COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as keyof Columns<T>;
+					const tempColumnName = UNIQUE_TEMP_COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as keyof TempColumnsForUnique<T>;
 					queryForHour[name] = new Set([...(v as string[]), ...(logHour[tempColumnName] as unknown as string[])]).size;
 					queryForDay[name] = new Set([...(v as string[]), ...(logDay[tempColumnName] as unknown as string[])]).size;
 				}
@@ -449,15 +449,15 @@ export default abstract class Chart<T extends Schema> {
 			for (const [k, v] of Object.entries(this.schema)) {
 				const intersection = v.intersection;
 				if (intersection) {
-					const name = columnPrefix + k.replaceAll('.', columnDot) as keyof Columns<T>;
+					const name = COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as keyof Columns<T>;
 					const firstKey = intersection[0];
-					const firstTempColumnName = uniqueTempColumnPrefix + firstKey.replaceAll('.', columnDot) as keyof TempColumnsForUnique<T>;
+					const firstTempColumnName = UNIQUE_TEMP_COLUMN_PREFIX + firstKey.replaceAll('.', COLUMN_DELIMITER) as keyof TempColumnsForUnique<T>;
 					const firstValues = finalDiffs[firstKey] as string[] | undefined;
 					const currentValuesForHour = new Set([...(firstValues ?? []), ...(logHour[firstTempColumnName] as unknown as string[])]);
 					const currentValuesForDay = new Set([...(firstValues ?? []), ...(logDay[firstTempColumnName] as unknown as string[])]);
 					for (let i = 1; i < intersection.length; i++) {
 						const targetKey = intersection[i];
-						const targetTempColumnName = uniqueTempColumnPrefix + targetKey.replaceAll('.', columnDot) as keyof TempColumnsForUnique<T>;
+						const targetTempColumnName = UNIQUE_TEMP_COLUMN_PREFIX + targetKey.replaceAll('.', COLUMN_DELIMITER) as keyof TempColumnsForUnique<T>;
 						const targetValues = finalDiffs[targetKey] as string[] | undefined;
 						const targetValuesForHour = new Set([...(targetValues ?? []), ...(logHour[targetTempColumnName] as unknown as string[])]);
 						const targetValuesForDay = new Set([...(targetValues ?? []), ...(logDay[targetTempColumnName] as unknown as string[])]);
@@ -510,7 +510,7 @@ export default abstract class Chart<T extends Schema> {
 
 		const columns = {} as Record<keyof Columns<T>, number>;
 		for (const [k, v] of Object.entries(data) as ([keyof typeof data, number])[]) {
-			const name = columnPrefix + (k as string).replaceAll('.', columnDot) as keyof Columns<T>;
+			const name = COLUMN_PREFIX + (k as string).replaceAll('.', COLUMN_DELIMITER) as keyof Columns<T>;
 			columns[name] = v;
 		}
 
@@ -556,7 +556,7 @@ export default abstract class Chart<T extends Schema> {
 		const columns = {} as Record<keyof TempColumnsForUnique<T>, []>;
 		for (const [k, v] of Object.entries(this.schema)) {
 			if (v.uniqueIncrement) {
-				const name = uniqueTempColumnPrefix + k.replaceAll('.', columnDot) as keyof TempColumnsForUnique<T>;
+				const name = UNIQUE_TEMP_COLUMN_PREFIX + k.replaceAll('.', COLUMN_DELIMITER) as keyof TempColumnsForUnique<T>;
 				columns[name] = [];
 			}
 		}