docs: add inferred legacy schema from CSV headers and .SC usage to guide migration

docs/legacy-schema.md

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+## Legacy schema (inferred)
+
+Source: headers in `old-database/Office/*.csv` (and subfolders) cross-checked against legacy `.SC` scripts.
+
+Notes
+- Types are inferred from names/usage; adjust during migration as needed.
+- Date fields are typically legacy date types (store as DATE). Money/amounts as DECIMAL(12,2).
+
+### ROLODEX
+- Id (TEXT, pk)
+- Prefix (TEXT)
+- First (TEXT)
+- Middle (TEXT)
+- Last (TEXT)
+- Suffix (TEXT)
+- Title (TEXT)
+- A1 (TEXT)
+- A2 (TEXT)
+- A3 (TEXT)
+- City (TEXT)
+- Abrev (TEXT)
+- St (TEXT)
+- Zip (TEXT)
+- Email (TEXT)
+- DOB (DATE)
+- SS# (TEXT)
+- Legal_Status (TEXT)
+- Group (TEXT)
+- Memo (TEXT)
+
+### PHONE (by Id)
+- Id (TEXT, fk → Rolodex.Id)
+- Phone (TEXT)
+- Location (TEXT)
+
+### FILES (file cabinet)
+- File_No (TEXT, pk)
+- Id (TEXT, fk → Rolodex.Id)
+- File_Type (TEXT, fk → FileType.File_Type)
+- Regarding (TEXT)
+- Opened (DATE)
+- Closed (DATE, nullable)
+- Empl_Num (TEXT, fk → Employee.Empl_Num)
+- Rate_Per_Hour (DECIMAL)
+- Status (TEXT, fk → FileStat.Status)
+- Footer_Code (TEXT, fk → Footers.F_Code)
+- Opposing (TEXT, fk → Rolodex.Id)
+- Hours (DECIMAL)
+- Hours_P (DECIMAL)
+- Trust_Bal (DECIMAL)
+- Trust_Bal_P (DECIMAL)
+- Hourly_Fees (DECIMAL)
+- Hourly_Fees_P (DECIMAL)
+- Flat_Fees (DECIMAL)
+- Flat_Fees_P (DECIMAL)
+- Disbursements (DECIMAL)
+- Disbursements_P (DECIMAL)
+- Credit_Bal (DECIMAL)
+- Credit_Bal_P (DECIMAL)
+- Total_Charges (DECIMAL)
+- Total_Charges_P (DECIMAL)
+- Amount_Owing (DECIMAL)
+- Amount_Owing_P (DECIMAL)
+- Transferable (DECIMAL)
+- Memo (TEXT)
+
+### FILES_R (relationships)
+- File_No (TEXT, fk → Files.File_No)
+- Relationship (TEXT)
+- Rolodex_Id (TEXT, fk → Rolodex.Id)
+
+### FILES_V (variables)
+- File_No (TEXT, fk → Files.File_No)
+- Identifier (TEXT)
+- Response (TEXT)
+
+### LEDGER
+- File_No (TEXT, fk → Files.File_No)
+- Date (DATE)
+- Item_No (INTEGER, part of pk per scripts use)
+- Empl_Num (TEXT, fk → Employee.Empl_Num)
+- T_Code (TEXT, fk → TrnsLkup.T_Code)
+- T_Type (TEXT, fk → TrnsType.T_Type)
+- T_Type_L (TEXT)
+- Quantity (DECIMAL)
+- Rate (DECIMAL)
+- Amount (DECIMAL)
+- Billed (TEXT, one of 'Y'/'N')
+- Note (TEXT)
+
+### TRNSACTN (joined outputs)
+- File_No (TEXT)
+- Id (TEXT)
+- Footer_Code (TEXT)
+- Date (DATE)
+- Item_No (INTEGER)
+- Empl_Num (TEXT)
+- T_Code (TEXT)
+- T_Type (TEXT)
+- T_Type_L (TEXT)
+- Quantity (DECIMAL)
+- Rate (DECIMAL)
+- Amount (DECIMAL)
+- Billed (TEXT)
+- Note (TEXT)
+
+### TRNSLKUP (transaction codes)
+- T_Code (TEXT, pk)
+- T_Type (TEXT, fk → TrnsType.T_Type)
+- T_Type_L (TEXT)
+- Amount (DECIMAL)
+- Description (TEXT)
+
+### TRNSTYPE (transaction groups)
+- T_Type (TEXT, pk)
+- T_Type_L (TEXT)
+- Header (TEXT)
+- Footer (TEXT)
+
+### FILESTAT
+- Status (TEXT, pk)
+- Definition (TEXT)
+- Send (TEXT)
+- Footer_Code (TEXT, fk → Footers.F_Code)
+
+### FOOTERS
+- F_Code (TEXT, pk)
+- F_Footer (TEXT)
+
+### EMPLOYEE
+- Empl_Num (TEXT, pk)
+- Empl_Id (TEXT, fk → Rolodex.Id)
+- Rate_Per_Hour (DECIMAL)
+
+### STATES
+- Abrev (TEXT, pk)
+- St (TEXT)
+
+### GRUPLKUP
+- Code (TEXT, pk)
+- Description (TEXT)
+- Title (TEXT)
+
+### SETUP
+- Appl_Title (TEXT)
+- L_Head1..L_Head10 (TEXT)
+- Default_Printer (INTEGER, fk → Printers.Number)
+
+### PRINTERS
+- Number (INTEGER, pk)
+- Name (TEXT)
+- Port (TEXT)
+- Page_Break (TEXT)
+- Setup_St (TEXT)
+- Phone_Book (TEXT)
+- Rolodex_Info (TEXT)
+- Envelope (TEXT)
+- File_Cabinet (TEXT)
+- Accounts (TEXT)
+- Statements (TEXT)
+- Calendar (TEXT)
+- Reset_St (TEXT)
+- B_Underline (TEXT)
+- E_Underline (TEXT)
+- B_Bold (TEXT)
+- E_Bold (TEXT)
+
+### DEPOSITS / PAYMENTS
+- Deposits
+  - Deposit_Date (DATE, pk?)
+  - Total (DECIMAL)
+- Payments
+  - Deposit_Date (DATE, fk → Deposits.Deposit_Date)
+  - File_No (TEXT, fk → Files.File_No)
+  - Id (TEXT, fk → Rolodex.Id)
+  - Regarding (TEXT)
+  - Amount (DECIMAL)
+  - Note (TEXT)
+
+### QDROS
+- File_No (TEXT)
+- Version (TEXT)
+- Plan_Id (TEXT)
+- ^1, ^2, ^Part, ^AltP, ^Pet, ^Res (TEXT)
+- Case_Type (TEXT)
+- Case_Code (TEXT)
+- Section (TEXT)
+- Case_Number (TEXT)
+- Judgment_Date (DATE)
+- Valuation_Date (DATE)
+- Married_On (DATE)
+- Percent_Awarded (DECIMAL)
+- Ven_City (TEXT)
+- Ven_Cnty (TEXT)
+- Ven_St (TEXT)
+- Draft_Out (DATE)
+- Draft_Apr (DATE)
+- Final_Out (DATE)
+- Judge (TEXT)
+- Form_Name (TEXT)
+
+### PLANINFO
+- Plan_Id (TEXT, pk)
+- Plan_Name (TEXT)
+- Plan_Type (TEXT)
+- Empl_Id_No (TEXT)
+- Plan_No (TEXT)
+- NRA (TEXT)
+- ERA (TEXT)
+- ERRF (TEXT)
+- COLAS (TEXT)
+- Divided_By (TEXT)
+- Drafted (TEXT)
+- Benefit_C (TEXT)
+- QDRO_C (TEXT)
+- ^REV (TEXT)
+- ^PA (TEXT)
+- Form_Name (TEXT)
+- Drafted_On (DATE)
+- Memo (TEXT)
+
+### PENSIONS (and related)
+- PENSIONS
+  - File_No (TEXT)
+  - Version (TEXT)
+  - Plan_Id (TEXT)
+  - Plan_Name (TEXT)
+  - Title (TEXT)
+  - First (TEXT)
+  - Last (TEXT)
+  - Birth (DATE)
+  - Race (TEXT)
+  - Sex (TEXT)
+  - Info (DATE)
+  - Valu (DATE)
+  - Accrued (DECIMAL)
+  - Vested_Per (DECIMAL)
+  - Start_Age (DECIMAL)
+  - COLA (DECIMAL)
+  - Max_COLA (DECIMAL)
+  - Withdrawal (DECIMAL)
+  - Pre_DR (DECIMAL)
+  - Post_DR (DECIMAL)
+  - Tax_Rate (DECIMAL)
+- RESULTS
+  - Accrued, Start_Age, COLA, Withdrawal, Pre_DR, Post_DR, Tax_Rate,
+  - Age, Years_From, Life_Exp, EV_Monthly, Payments, Pay_Out,
+  - Fund_Value, PV, Mortality, PV_AM, PV_AMT, PV_Pre_DB, PV_Annuity,
+  - WV_AT, PV_Plan, Years_Married, Years_Service, Marr_Per, Marr_Amt
+- MARRIAGE
+  - File_No, Version, Married_From, Married_To, Married_Years,
+  - Service_From, Service_To, Service_Years, Marital_%
+- DEATH
+  - File_No, Version, Lump1, Lump2, Growth1, Growth2, Disc1, Disc2
+- SCHEDULE
+  - File_No, Version, Vests_On (DATE), Vests_At (DECIMAL)
+- SEPARATE
+  - File_No, Version, Separation_Rate (DECIMAL)
+- Life Tables (reference data)
+  - FORMS/LIFETABL, FORMS/NUMBERAL, PENSIONS/LIFETABL, PENSIONS/NUMBERAL
+
+