Squashed commit of the following:

commit d2ec8c0f07
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 15:42:33 2025 +0700

    add: db tx commit and rollback implementation

commit 264435f67e
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 14:34:20 2025 +0700

    fix: shortlink generation logic update/create

commit 047ab1937a
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 11:06:04 2025 +0700

    fix: if multiple studies patient, show first study by default

commit c13f834b92
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 09:46:32 2025 +0700

    add: register and login with DB query AND some struct type correction

commit dd4451c2a8
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Wed May 14 10:23:33 2025 +0700

    new file structure & koneksi ke DB

commit 8289881df3
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 16:49:07 2025 +0700

    edit: rm debug route

commit dd784da232
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 15:44:11 2025 +0700

    add: implement shortlink

commit 2687a761cc
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 11:47:19 2025 +0700

    add new dummy doctor user

commit eb67eaca46
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 11:46:28 2025 +0700

    add: ref_doctor studylist filter

commit 0d4825d152
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 10:07:16 2025 +0700

    edit study_iuids & accNum in patient jwt to array

commit 2d1f135fda
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 09:52:45 2025 +0700

    patient see their multiple studies

commit 13bb380f51
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Fri May 9 10:13:16 2025 +0700

    add: cors handler route and readme

commit 6c9ab574ce
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon May 5 11:50:36 2025 +0700

    add: login & token validation tapi belum connect ke DB

commit 297c9a6a01
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon Apr 28 15:37:02 2025 +0700

    add readme.md

commit 9b8e0260f3
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon Apr 7 15:46:07 2025 +0700

    connected-to-google

commit f340bc5916
Author: mario <dev.mario@sismedika.com>
Date:   Mon Apr 7 11:14:18 2025 +0700

    init

internal/api/repository/study.go

@@ -0,0 +1,100 @@
+package repository
+
+import (
+	"fmt"
+	"time"
+
+	"devone.aplikasi.web.id/gitea/mario/go-ohif-proxy/internal/api/models"
+	"devone.aplikasi.web.id/gitea/mario/go-ohif-proxy/internal/database"
+	"github.com/jmoiron/sqlx"
+)
+
+// DBStudy represents a study from the database
+type DBStudy struct {
+	ID                   int       `db:"id"`
+	Study_PatientID      string    `db:"Study_PatientID"`
+	StudyIUID            string    `db:"StudyIUID"`
+	StudyAccessionNumber string    `db:"StudyAccessionNumber"`
+	StudyDate            time.Time `db:"StudyDate"`
+	StudyCreatedAt       time.Time `db:"StudyCreatedAt"`
+	StudyUpdatedAt       time.Time `db:"StudyUpdatedAt"`
+}
+
+// StudyRepository handles database operations related to studies
+type StudyRepository struct {
+	*Repository
+}
+
+// NewStudyRepository creates a new study repository
+func NewStudyRepository() *StudyRepository {
+	return &StudyRepository{
+		Repository: NewRepository(),
+	}
+}
+
+// GetPatientStudies retrieves all studies for a patient
+func (r *StudyRepository) GetPatientStudies(patientID string) ([]string, []string, error) {
+	var studies []DBStudy
+
+	query := `SELECT * FROM study WHERE Study_PatientID = ?`
+	err := database.DB.Select(&studies, query, patientID)
+
+	if err != nil {
+		return nil, nil, fmt.Errorf("database error getting patient studies: %w", err)
+	}
+
+	var studyUIDs []string
+	var accessionNumbers []string
+
+	for _, study := range studies {
+		studyUIDs = append(studyUIDs, study.StudyIUID)
+		if study.StudyAccessionNumber != "" {
+			accessionNumbers = append(accessionNumbers, study.StudyAccessionNumber)
+		}
+	}
+
+	return studyUIDs, accessionNumbers, nil
+}
+
+// GetStudyByUID retrieves a study by its UID
+func (r *StudyRepository) GetStudyByUID(studyUID string) (*DBStudy, error) {
+	var study DBStudy
+
+	query := `SELECT * FROM study WHERE StudyIUID = ?`
+	err := database.DB.Get(&study, query, studyUID)
+
+	if err != nil {
+		return nil, fmt.Errorf("database error getting study: %w", err)
+	}
+
+	return &study, nil
+}
+
+// CreateStudyTx creates a new study record for a patient within a transaction
+func (r *StudyRepository) CreateStudyTx(tx *sqlx.Tx, patientID string, study models.Study) error {
+	// Parse study date if provided
+	var studyDate *time.Time
+	if study.StudyDate != "" {
+		parsedTime, err := time.Parse("2006-01-02", study.StudyDate)
+		if err != nil {
+			return fmt.Errorf("invalid study date format: %w", err)
+		}
+		studyDate = &parsedTime
+	}
+
+	query := `INSERT INTO study 
+		(Study_PatientID, StudyIUID, StudyAccessionNumber, StudyDate, StudyCreatedAt, StudyUpdatedAt) 
+		VALUES (?, ?, ?, ?, NOW(), NOW())`
+
+	_, err := tx.Exec(query,
+		patientID,
+		study.StudyInstanceUID,
+		study.AccessionNumber,
+		studyDate)
+
+	if err != nil {
+		return fmt.Errorf("database error creating study: %w", err)
+	}
+
+	return nil
+}