diff --git a/apps/api/drizzle/0005_freezing_siren.sql b/apps/api/drizzle/0005_freezing_siren.sql
new file mode 100644
index 0000000..03c4464
--- /dev/null
+++ b/apps/api/drizzle/0005_freezing_siren.sql
@@ -0,0 +1,12 @@
+CREATE TABLE "routine_schedules" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"routine_id" uuid NOT NULL,
+	"day_of_week" smallint NOT NULL,
+	"local_time" time(0) NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL,
+	CONSTRAINT "routine_schedules_day_of_week_supported" CHECK ("routine_schedules"."day_of_week" BETWEEN 0 AND 6)
+);
+--> statement-breakpoint
+ALTER TABLE "routine_schedules" ADD CONSTRAINT "routine_schedules_routine_id_routines_id_fk" FOREIGN KEY ("routine_id") REFERENCES "public"."routines"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "routine_schedules_routine_day_time_unique" ON "routine_schedules" USING btree ("routine_id","day_of_week","local_time");
\ No newline at end of file
diff --git a/apps/api/drizzle/meta/0005_snapshot.json b/apps/api/drizzle/meta/0005_snapshot.json
new file mode 100644
index 0000000..16428d3
--- /dev/null
+++ b/apps/api/drizzle/meta/0005_snapshot.json
@@ -0,0 +1,584 @@
+{
+  "id": "8e09e649-8bf9-41e8-92d1-b9d3cd08d4d0",
+  "prevId": "4b0ccca9-4c6f-4809-9675-3abccf9aeb34",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "public.exercises": {
+      "name": "exercises",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "uuid",
+          "primaryKey": true,
+          "notNull": true,
+          "default": "gen_random_uuid()"
+        },
+        "owner_user_id": {
+          "name": "owner_user_id",
+          "type": "uuid",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "exercises_owner_user_id_idx": {
+          "name": "exercises_owner_user_id_idx",
+          "columns": [
+            {
+              "expression": "owner_user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "exercises_owner_user_id_users_id_fk": {
+          "name": "exercises_owner_user_id_users_id_fk",
+          "tableFrom": "exercises",
+          "tableTo": "users",
+          "columnsFrom": ["owner_user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.routine_exercises": {
+      "name": "routine_exercises",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "uuid",
+          "primaryKey": true,
+          "notNull": true,
+          "default": "gen_random_uuid()"
+        },
+        "routine_id": {
+          "name": "routine_id",
+          "type": "uuid",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "exercise_id": {
+          "name": "exercise_id",
+          "type": "uuid",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "position": {
+          "name": "position",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "sets": {
+          "name": "sets",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "target_reps": {
+          "name": "target_reps",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "weight": {
+          "name": "weight",
+          "type": "numeric(8, 2)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "weight_unit": {
+          "name": "weight_unit",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "rest_between_sets_seconds": {
+          "name": "rest_between_sets_seconds",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "default": 0
+        },
+        "rest_after_exercise_seconds": {
+          "name": "rest_after_exercise_seconds",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "default": 0
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "routine_exercises_routine_position_unique": {
+          "name": "routine_exercises_routine_position_unique",
+          "columns": [
+            {
+              "expression": "routine_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "position",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": true,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "routine_exercises_exercise_id_idx": {
+          "name": "routine_exercises_exercise_id_idx",
+          "columns": [
+            {
+              "expression": "exercise_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "routine_exercises_routine_id_routines_id_fk": {
+          "name": "routine_exercises_routine_id_routines_id_fk",
+          "tableFrom": "routine_exercises",
+          "tableTo": "routines",
+          "columnsFrom": ["routine_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "routine_exercises_exercise_id_exercises_id_fk": {
+          "name": "routine_exercises_exercise_id_exercises_id_fk",
+          "tableFrom": "routine_exercises",
+          "tableTo": "exercises",
+          "columnsFrom": ["exercise_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {
+        "routine_exercises_position_nonnegative": {
+          "name": "routine_exercises_position_nonnegative",
+          "value": "\"routine_exercises\".\"position\" >= 0"
+        },
+        "routine_exercises_sets_positive": {
+          "name": "routine_exercises_sets_positive",
+          "value": "\"routine_exercises\".\"sets\" > 0"
+        },
+        "routine_exercises_target_reps_positive": {
+          "name": "routine_exercises_target_reps_positive",
+          "value": "\"routine_exercises\".\"target_reps\" > 0"
+        },
+        "routine_exercises_weight_nonnegative": {
+          "name": "routine_exercises_weight_nonnegative",
+          "value": "\"routine_exercises\".\"weight\" >= 0"
+        },
+        "routine_exercises_weight_unit_supported": {
+          "name": "routine_exercises_weight_unit_supported",
+          "value": "\"routine_exercises\".\"weight_unit\" IN ('lb', 'kg')"
+        },
+        "routine_exercises_rest_between_sets_nonnegative": {
+          "name": "routine_exercises_rest_between_sets_nonnegative",
+          "value": "\"routine_exercises\".\"rest_between_sets_seconds\" >= 0"
+        },
+        "routine_exercises_rest_after_exercise_nonnegative": {
+          "name": "routine_exercises_rest_after_exercise_nonnegative",
+          "value": "\"routine_exercises\".\"rest_after_exercise_seconds\" >= 0"
+        }
+      },
+      "isRLSEnabled": false
+    },
+    "public.routine_schedules": {
+      "name": "routine_schedules",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "uuid",
+          "primaryKey": true,
+          "notNull": true,
+          "default": "gen_random_uuid()"
+        },
+        "routine_id": {
+          "name": "routine_id",
+          "type": "uuid",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "day_of_week": {
+          "name": "day_of_week",
+          "type": "smallint",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "local_time": {
+          "name": "local_time",
+          "type": "time(0)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "routine_schedules_routine_day_time_unique": {
+          "name": "routine_schedules_routine_day_time_unique",
+          "columns": [
+            {
+              "expression": "routine_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "day_of_week",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "local_time",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": true,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "routine_schedules_routine_id_routines_id_fk": {
+          "name": "routine_schedules_routine_id_routines_id_fk",
+          "tableFrom": "routine_schedules",
+          "tableTo": "routines",
+          "columnsFrom": ["routine_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {
+        "routine_schedules_day_of_week_supported": {
+          "name": "routine_schedules_day_of_week_supported",
+          "value": "\"routine_schedules\".\"day_of_week\" BETWEEN 0 AND 6"
+        }
+      },
+      "isRLSEnabled": false
+    },
+    "public.routines": {
+      "name": "routines",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "uuid",
+          "primaryKey": true,
+          "notNull": true,
+          "default": "gen_random_uuid()"
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "uuid",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "routines_user_id_idx": {
+          "name": "routines_user_id_idx",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "routines_user_id_users_id_fk": {
+          "name": "routines_user_id_users_id_fk",
+          "tableFrom": "routines",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.sessions": {
+      "name": "sessions",
+      "schema": "",
+      "columns": {
+        "sid": {
+          "name": "sid",
+          "type": "varchar",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "sess": {
+          "name": "sess",
+          "type": "json",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "expire": {
+          "name": "expire",
+          "type": "timestamp (6)",
+          "primaryKey": false,
+          "notNull": true
+        }
+      },
+      "indexes": {
+        "sessions_expire_idx": {
+          "name": "sessions_expire_idx",
+          "columns": [
+            {
+              "expression": "expire",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.users": {
+      "name": "users",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "uuid",
+          "primaryKey": true,
+          "notNull": true,
+          "default": "gen_random_uuid()"
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "avatar_url": {
+          "name": "avatar_url",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "auth_provider": {
+          "name": "auth_provider",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "auth_provider_subject": {
+          "name": "auth_provider_subject",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "users_auth_provider_subject_unique": {
+          "name": "users_auth_provider_subject_unique",
+          "columns": [
+            {
+              "expression": "auth_provider",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "auth_provider_subject",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": true,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    }
+  },
+  "enums": {},
+  "schemas": {},
+  "sequences": {},
+  "roles": {},
+  "policies": {},
+  "views": {},
+  "_meta": {
+    "columns": {},
+    "schemas": {},
+    "tables": {}
+  }
+}
diff --git a/apps/api/drizzle/meta/_journal.json b/apps/api/drizzle/meta/_journal.json
index f514a65..dd1ba9c 100644
--- a/apps/api/drizzle/meta/_journal.json
+++ b/apps/api/drizzle/meta/_journal.json
@@ -36,6 +36,13 @@
       "when": 1787608832607,
       "tag": "0004_huge_veda",
       "breakpoints": true
+    },
+    {
+      "idx": 5,
+      "version": "7",
+      "when": 1787609439724,
+      "tag": "0005_freezing_siren",
+      "breakpoints": true
     }
   ]
 }
diff --git a/apps/api/src/db/schema/index.ts b/apps/api/src/db/schema/index.ts
index f620e3b..374d594 100644
--- a/apps/api/src/db/schema/index.ts
+++ b/apps/api/src/db/schema/index.ts
@@ -1,6 +1,7 @@
 /** Exposes the complete Drizzle schema from feature-focused table modules. */
 export * from './exercises.js';
 export * from './routine-exercises.js';
+export * from './routine-schedules.js';
 export * from './routines.js';
 export * from './sessions.js';
 export * from './users.js';
diff --git a/apps/api/src/db/schema/routine-schedules.ts b/apps/api/src/db/schema/routine-schedules.ts
new file mode 100644
index 0000000..e50e1f0
--- /dev/null
+++ b/apps/api/src/db/schema/routine-schedules.ts
@@ -0,0 +1,53 @@
+/** Defines optional recurring local schedule entries for workout routines. */
+import { sql } from 'drizzle-orm';
+import {
+  check,
+  pgTable,
+  smallint,
+  time,
+  timestamp,
+  uniqueIndex,
+  uuid,
+} from 'drizzle-orm/pg-core';
+
+import { routines } from './routines.js';
+
+export const routineSchedules = pgTable(
+  'routine_schedules',
+  {
+    /** Primary identifier for the planned schedule entry. */
+    id: uuid('id').defaultRandom().primaryKey(),
+
+    /** Routine planned for this recurring day and local time. */
+    routineId: uuid('routine_id')
+      .notNull()
+      .references(() => routines.id, { onDelete: 'cascade' }),
+
+    /** Day of week using Sunday 0 through Saturday 6. */
+    dayOfWeek: smallint('day_of_week').notNull(),
+
+    /** User-local planned workout time without a time-zone offset. */
+    localTime: time('local_time', { precision: 0 }).notNull(),
+
+    /** Time when the schedule entry was created. */
+    createdAt: timestamp('created_at', { withTimezone: true })
+      .defaultNow()
+      .notNull(),
+
+    /** Time when the schedule entry was last changed. */
+    updatedAt: timestamp('updated_at', { withTimezone: true })
+      .defaultNow()
+      .notNull(),
+  },
+  (table) => [
+    uniqueIndex('routine_schedules_routine_day_time_unique').on(
+      table.routineId,
+      table.dayOfWeek,
+      table.localTime,
+    ),
+    check(
+      'routine_schedules_day_of_week_supported',
+      sql`${table.dayOfWeek} BETWEEN 0 AND 6`,
+    ),
+  ],
+);
diff --git a/docs/database.md b/docs/database.md
index 8a1415a..a6d210a 100644
--- a/docs/database.md
+++ b/docs/database.md
@@ -288,7 +288,7 @@ Example:
 |---|---|---|
 | `id` | UUID | Primary identifier for the scheduled occurrence. |
 | `routine_id` | UUID, FK → `routines.id` | Identifies the routine being scheduled. |
-| `day_of_week` | SMALLINT | Day on which the routine is planned. Use a clearly documented convention such as 0–6. |
+| `day_of_week` | SMALLINT | Day on which the routine is planned: Sunday is 0 through Saturday as 6, matching JavaScript's day convention. |
 | `local_time` | TIME | User-local planned workout time. |
 | `created_at` | TIMESTAMPTZ | When the schedule was created. |
 | `updated_at` | TIMESTAMPTZ | When the schedule was last modified. |