Restaurant reservations – Tables combinations

I have 3 tables in a reservation system for a restaurant. So far the software was used only by restaurant’s staff, however we want to accept reservations online as well. We have some small tables for 2 that can be easily moved to each other and make room for bigger parties and I want to accept reservations automatically if all of the tables that can be combined are available.

tables: holds all tables for each area in the restaurant.

| id | min_capacity | max_capacity | name | area   |
|----|--------------|--------------|------|--------|
| 1  | 2            | 4            | #1   | Inside |
| 2  | 6            | 8            | #2   | Inside |

reservations: holds reservation details

| id | datetime            | name     | status   |
|----|---------------------|----------|----------|
| 1  | 2020-09-01 20:00:00 | John Doe | Upcoming |
| 2  | 2020-09-05 13:00:00 | Jane Doe | Upcoming |

And one pivot table that holds reservation <=> table relation:

| id | table_id | reservation_id |
|----|----------|----------------|
| 1  | 1        | 1              |
| 2  | 2        | 2              |

How can I store different combinations of tables (manually entered) and “attach” reservations to tables/table combinations (so I can check if tables are available for specific time) efficiently?

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Author: Clarissa