Wordpress save 500 error jobs

Looking for a CRM expert who can help me streamline my workflow by setting up 3 boards with advanced automation features. Key Responsibilities: - Implement automation to streamline repetitive tasks, thus increasing efficiency and minimizing human error. - Configure the system to trigger actions based on specific events/actions. - Automate the process of task assignment, status updates and data syncing, making every step in the project lifecycle transparent and traceable. - Create a robust system for sending notifications and reminders, thus ensuring no important deadline is missed. Ideal Candidate: - Extensive experience with CRM, particularly with advanced automation features. - Track record of excellent problem-solving skills, attention to detail, and the ability

We are academic researchers interested studying visit patterns to Museums, Aquariums, and Zoos, in the United States. We are seeking assistance in collecting reported visit counts for the year 2019 from 500 museums, 100 zoos, and 100 aquariums across the United States. We will send you an excel spreadsheet with the name and state of each location we would like visits counts for. Note that these ~700 locations have been pre-selected. Task: - Search the internet for reported visits to each location in 2019 - If you can find the number of visits, please enter that number in the "visits" column AND paste the link to the website / source from which you obtained that number in the "link" column - If you cannot find an official reported figure for 2019 after som...

I need a consultant to assist me in creating a listing for my lodge on booking.com. - You can view the property at ?igsh=c2s1OW9ja2lldnhn&utm_source=qr. - I have all the necessary information and photographs ready for the listing. - Once the listing is created, I don't require further assistance in managing the listing. Ideal Skills: - Experience with and its listing process - Ability to create engaging and accurate property descriptions - Strong English language proficiency for error-free writing - Attention to detail to ensure all listing details are correct Experience in setting up property listings on other similar platforms is a plus but not necessary. This is a one-off job for initial setup of the room listing.

...identify the specific issues causing the Facebook login failure on the iOS app. Review Facebook SDK Integration: Evaluate the integration of Facebook SDK within the iOS app to ensure compliance with the latest SDK version and best practices. Address Authentication Errors: Implement necessary changes to resolve authentication errors encountered during the Facebook login process. Error Handling and Logging: Enhance error handling mechanisms and implement robust logging to capture any future issues related to Facebook login for prompt resolution. Testing and Validation: Rigorously test the updated Facebook login functionality across various iOS devices and environments to ensure reliability and compatibility. Documentation and Reporting: Document all changes made to the Faceb...

*READ ENTIRE FILE AND DO NOT BID UNLESS YOU ARE AN AI EXPERT *DO NOT BID UNLESS YOU CAN COMPLETE THIS WITHIN 7 TO 14 DAYS *BID AMOUNT IS FINAL -------------------------------------------------------- I require an AI expert, preferably well-versed with OpenAI's API, to add an AI virtual assistant to my Learning Management System (LMS). Features the AI Should Have: ...app onto server and work with files Text to speech must read lesson which is viewed through pdf viewer Stop when it identifies video file, show button which says [Resume] to continue text to speech When encounters question, throw up chat assistant and help guide student to answer question Guidance should be grade appropriate and should also be voice / text [2 options] YOU WILL ENCOUNTER ATTACHED ERROR [PLEASE BE P...

Proposal for GCC Tax Laws GPT Development Introduction We aim to revolutionize how businesses handle compliance with GCC tax laws—introducing GCC TAX LAWS GPT, a groundbreaking AI-powered tool designed to streamline GCC Tax Laws processes and save you time and money. We are looking for an eligible and experienced programmer to develop and implement the AI and GPT platforms. The developer must understand AI requirements and develop AI functionalities in GCC tax laws. The Challenge GCC Tax Laws and regulations can be complex and ever-changing. Manually navigating these complexities can be time-consuming, prone to errors, and lead to costly penalties. The term GCC stands for Gulf Country Council, which brings six Gulf nations together, i.e., Bahrain, Kuwait, Oman, Qatar, Saudi A...

I'm currently struggling with a logic error related to file location mismatch in my Google Colab notebook. I'm attempting to train a neural network model, however, this recurring issue is hindering progress. To solve this problem, I am seeking an individual with the following skills and experience: - Proficiency in debugging and solving logic errors, specifically those related to file location mismatches - Thorough understanding and practical experience with neural network models - Familiarity with Google Colab Notebooks and how they manage files and directories - Proven ability to quickly identify and resolve issues affecting model training My aim is to have this issue corrected promptly so I can continue with my model training.

I need a Unity specialist to develop a system in an existing v6.x.x game that can save user progress and allow players to pick up where they left off. Key requirements are: - Ability to save character progress and levels - User frame should include the character's current level and experience points. Ideal candidates must have vast working experience in Unity engine and a strong understanding of game development & player progression systems. Your solution should be robust, able to handle varying amounts of data, and run smoothly within the existing game structure. Prior experience in creating similar save game systems is a bonus.

...place on May 30th, 1999. On that day, Francis Reyes, a 34-year-old guide, was leading a group on a commercial caving expedition in Cueva Angeles. The group encountered a sudden rise in water levels within the cave's stream passage. Elba Vasquez Gonzales, one of the clients, was unable to escape to safety and got trapped by the floodwaters. Reyes heroically attempted to rescue her and managed to save her life, but tragically, he was carried away by the strong current and lost his life. This event was covered by several news outlets, with one article titled ‘Era un experto en las Cuevas’ by Julio Ghigliotty, published in El Nuevo Día on June 1st, 1999. However, I have not been successful in locating this article or any others from Puerto Rican sources. Pos...

I require an experienced freelancer to manage 100-500 product uploads from my Shopify store to the Shein marketplace. Key task: - You'll be provided with the product images, descriptions, SKU, and inventory details for upload. Categorization: - The products also need to be correctly categorized into existing Shein marketplace categories. Ideal Skills: - Shopify and Shein marketplace experience - Attention to detail - Strong data entry skills - Excellent categorization ability.

...a skilled technician to automate various tasks I currently handle manually. The tasks include data entry, report generation, and email communication. - Data Entry & Report Generation: Although I've skipped the question regarding the volume of data, expect a variable load. You'll need skill in automation tools to streamline the process efficiently, rendering it less laborious and prone to human error. - Email Automation: At present, I handle emails manually which is quite time-consuming. I'm looking for someone skilled in automatic email response systems to ensure prompt and accurate replies. Skills and Experience: - Experience in Robotic Process Automation or similar technologies - Proficiency in automatic email systems - Excellent in problem-solving with dat...

I am looking for a profession...detailed wing with fine feathers, but can show the general shape or idea. It can be merged with the R in Roam or be a standalone. Roam can be in capital letters or all lower case and should be a sans serif font or deviation from sans serif. Colors will need to be submitted as well for the brand identity, as well as the primary and secondary color sets for web. Update: it looks like my edit didn't save for some reason. There should be only a single wing, with the feathers to the left and the base of the wing towards the right to show forward movement. This can be integrated with the "r" in roam, or should be able to be pulled out as a stand alone favicon. We will eventually need multiple orientations, primary, secondary, submark a...

...with extensive experience in resolving issues related to the ADR6 table in SAP. The primary issue I am encountering is an ASSERT dump when attempting to update the table. Your task will be to resolve this and improve the overall functionality of the table. Key Responsibilities: - Identify the root cause of the ASSERT dump when updating the ADR6 table. - Resolve the issue to ensure successful and error-free updates. - Optimize the ADR6 table to improve system performance and ensure accurate communication mail ids. Ideal Candidate: - Proven experience working with the SAP ADR6 table. - Strong understanding of ABAP programming language. - Ability to troubleshoot and resolve complex technical issues in SAP. - Prior experience with ASSERT dump errors in the ADR6 table would be highl...

I need a professional with proven experience in converting email images to HTML that works smoothly in Microsoft Outlook. This ta...HTML/CSS - Experience in converting images into HTML especially for email templates - Familiarity with Outlook's HTML compatibility - Ability to adhere to design guidelines and recreate styles from images - Usage of Figma (is a must) Attention to detail and commitment to deadlines are critical for this project. Only individuals with relevant experience and positive track records need to apply. Let's save us both time. Figma Link: Figma Dev Link:

I'm in need of an expert in App, specifically with iOS submission. My applic...App, specifically with iOS submission. My application process is presently incomplete with Apple's iOS platform. While attempting to submit the app, I encounter an unexpected message; the details of this message aren’t included in the typical error codes - hence, your role will be to uncover the root cause and resolve it. REQUIRED SKILLS: - Proven experience with App development - A solid understanding of iOS application submission processes - Proficiency in troubleshooting and debugging - Ability to identify and fix a non-standard error message This project needs absolute expertise, strong technical acumen, persistence, and creative problem-solving skills. Looking forward ...

...payment gateway or similar third-party payment systems is highly preferred. Familiarity with handling transaction callbacks and response validation is essential. API Integration Skills: The developer should be well-versed in working with APIs and implementing callback mechanisms to process transaction notifications from PhonePe securely. Security and Error Handling: Ensuring secure handling of sensitive transaction data and implementing robust error handling mechanisms to manage edge cases and ensure smooth operation of the payment flow. Communication and Collaboration: Clear communication and the ability to collaborate effectively with the Android app developer to ensure seamless integration between the frontend and backend components. If you possess the required skills a...

I need the online / offline sync to work seamlessly. We have a react native...home those records vanished. They weren't synced to mongodb and where no longer present in the app. There is no delete functionality in the app. There is a function which checks for online status using netinfo and then when online will re start the sync session with mongodb. There is a frontend indicator which shows the realm connection status and the network connection status. At the time of this error it was reported the indicator which shows realm is connected was flashing both offline and online rapidly which may be the cause of what happened. i think the issue resides in Providers > RealmSubscriptionProvider Instructions yarn to install then yarn android to spin up dev env, api key will be ...

I need a modern, sleek logo for a cheerleading competition. It should feel inspired by the Daytona 500 – think blue, black, and white. The logo should incorporate racing elements like a checkered flag and a trophy. Designers with a knack for marrying sports themes with clean, modern aesthetics would be an ideal fit for this project. We call this competition Victory500 (we give away 2 $500.00 scholarships)

...bedding, modern decor, or gourmet kitchens. Guest Testimonials: Share positive experiences from past guests, ideally with photos of them enjoying their stay. Local Attractions: Feature beautiful shots of Rio’s landmarks and scenery, tying them back to the convenience and charm of staying at your properties. Instagram Stories and Highlights: Utilize Stories for real-time updates or special offers, and save them as Highlights for easy access. This could include live walkthroughs of the apartments, guest interviews, or behind-the-scenes looks at the area. We have moe than 3,000 photos from the apts recently taken which we will make available for the job. Key Requirements: - Develop a modern and minimalist visual style for the posts - Create engaging content that will resona...

...admin and church's WordPress website, I just don't have time to solve an error that suddenly appeared. There were regular backups available through a WordPress plugin. For this task, I am seeking a proficient freelancer who can: - Diagnose the critical error and repair the functionalities of the navigation menu, contact form, and media files - Successfully restore the website using available backups if necessary - Provide a rundown of potential causes so a similar event can be avoided in the future Ideal candidates should possess the following skills and experiences: - Expert knowledge in WordPress website troubleshooting and maintenance - Reliable experience in using WordPress plugins and theme navigation (Elementor Pro and Astr...

I'm in search of a TON chain expert with prior experience in presale to help fix existing errors in my project. Key Requirements: - TON Chain Expertise: Profound knowledge of TON chain and hands-on experience in working with it is a must. - Presale Experience: Prior experience in developing and managing presale projects is highly preferred. - Error Fixing: Capable of identifying and rectifying errors in an existing TON chain implementation. - Presale Launch Pad: Ability to implement and manage a presale launch pad within the TON chain. Your primary responsibilities will include: - Identifying and fixing errors in the current TON chain implementation. - Implementing a presale launch pad within the TON chain. - Assisting in the development of a successful presale strategy. Ide...

I'm seeking a HubSpot professional to efficiently set up the platform to manage my customer relationships. The primary goal is to establish a smooth process that supports my business, consisting of 100-500 customers. Key responsibilities: - Set up email tracking to monitor customer communication - Configure a deals tracking system to oversee business progress - Implement contact management cascades to handle multiple clients simultaneously Ideal candidate: - Extensive experience in setting up and managing HubSpot - Proven record in CRM management - Fine attention to detail

I'm facing an issue with logging into my WordPress account. When I try to log in, nothing happens. There are no error messages, and the page just remains the same as before. This issue has been persistent and there have been no recent changes made to the website that could have triggered this. Ideal Skills and Experience: - Proficiency in WordPress - Strong understanding of various WordPress login issues and their resolutions - Troubleshooting skills to identify the root cause - Experience in resolving login-related bugs or issues

As a vendor, I have three excel sheets containing product numbers and corresponding data. Both sheets are error-free and completely filled in, but the second sheet has its entries in a mixed order. I need a freelancer who is adept in working with Excel to match the data in the sheets based on product I.D number using the product numbers and or product name (TRS Direct Sheet) to match the size dimensions in the other sheets as highlighted via colored columns (must match colors) Sheet format cannot be moved or changed or altered in the cells already published on the 2 sheets as listed only the DATA MASTA it effects the upload process. area highlight pink no information or changes to be made or added please scroll through to observe existing pink cells. Here's a detailed breakdow...

I'm looking to test the scalability of my web application. The goal is to assess how the application performs when subjected to a significant load and to identify any potential bottlenecks. Specifically, I'm probing: - User interface functionalities - Database interactions For these tests, we'll simulate the activity of 100-500 concurrent users. This task would be best suited to a professional experienced in using JMeter for load testing web applications. Skills in web development would be advantageous, to help understand functionality and potential errors. Your deliverable is a detailed report with insights and recommendations on where and how the web application can be upgraded for scalability. Work location - North Bengaluru (North Bangalore). Remote ...

...integrated into the project. - The project also needs deployment on AWS. The most crucial aspect of the deployment is ensuring that it's done correctly. The project is already developed and available on Github at the developer has to make the project work and deploy it on AWS cloud. I will provide the Places API key. Has to solve any error that comes and deploy the project on AWS error free. The ideal candidate for this project would have: - Proficiency in Full Stack JavaScript development. - Previous experience working with the Google Maps API and the Places API. - Extensive expertise in AWS deployment, focusing on ensuring the deployment is done correctly. -Expertise with PostgresSQL. If you're confident in your ability to deliver on these requirements

...Your familiarity with standard fact-checking protocols will be necessary for the creation of our guide and assessment of the software tool. Our main goals for this project are: - Improve Fact-Checking Accuracy: With your help, we aim to tighten our process and reduce inaccuracies. - Enhance Fact-Checking Efficiency: Through the testing of Authentification, you will determine if the tool can save us time and resources in our fact-checking process. - Evaluate Software Effectiveness: Your feedback will be instrumental in our assessment of the software’s effectiveness. Finally, the fact-checker guide should have: - A clear, Step-by-step Fact-checking Process. - Understanding and practical Tips for Verifying Information. - A primer on Guidelines for Identifying Misinfo...

I'm in search of a skilled social media marketer to help me with my campaign that mainly focuses on Facebook and Instagram. My primary goal is to engage with my audience and promote my brand effectively through various content types such as videos, images, and written posts. I am a doctor in India, I wish to create an educational Instagram page. The purpose of this page is build ...Good communication and interpersonal skills My target audience is Indian women. I have my Instagram page for reference: This is the Instagram page I want to evolve into In summary I need: 1) a social media marketing expert who can help me build my audience who are engaging with me 2) I need a video editing expert Looking to pay 500 INR per reel.

I'm running a wedding photography business and I need to find someone who can achieve a certain style. Please check out this website: This warm, earthy and slightly creamy style is what I need. ...Wage rates: 50 photos - 70 usd 100 photos: 100 usd 200 photos: 180 usd 400 photos: 250 usd Tips: Study this style really in detail and watch some youtube tutorals for help (website: instagram: There are many presets out there that are similar to this style. Find a good one that you can apply to most of the photos to save yourself a lot of time. Please study the reference photos, they differ a little bit depending on where it is (inside/outdoors, dark church or green field, and the people.

Need someone who has experience in apps especially android ones and has experience in development and bug fixing and basic knowledge about apps

I'm currently working on a project that involves compiler construction in Java. I'm looking for a professional who can deliver effective semantical analysis ensuring that my proje...experience in Java. Key requirements include: - In-depth understanding of compiler construction principles - Proven experience in semantic analysis - Proficient in Java programming - Ability to deliver error messages for incorrect syntax - Familiarity with integrating semantical analysis into existing Java projects This project has already integrated the semantical analysis, and you will be required to enhance it to effectively identify and report errors in the code. Your work should be able to highlight any syntax issues within the project, providing clear and concise error ...

I'm encountering issues related to error messages, performance, and functionality bugs with my Laravel PHP scripts. I am seeking a skilled Laravel developer who can fix these issues and perform a minor customization of the scripts. The ideal candidate for this job should: - Have extensive experience with Laravel PHP - this includes, but is not limited to, fixing bugs, optimizing performance, and customizing scripts. - Be able to generate a detailed project proposal outlining their approach to the tasks at hand. - Understand that while I don't have previous or competitor projects to use as an example, I do have specific ideas about what my desired outcomes are. Your proposal should demonstrate understanding of these requirements and propose a solution to address the iss...

...server settings. I am currently experiencing email-related issues with my AspDotNet storefront. I have checked the admin panel email settings and are correct and temperamental. They sometimes work, then completely stop. The project involves: • Identifying and resolving email issues, as neither sending nor receiving emails is functioning properly. • Assisting in effective troubleshooting without error messages or codes. Ideal skills and experience for this task include: • Knowledge and experience with AspDotNetStorefront. • Ability to troubleshoot and resolve email dysfunction issues. • Excellent problem-solving skills with minimal available data. • Experience in working with email server settings. I am looking for an efficient fix, but also ex...

I'm seeking an experienced PHP developer to help me address some pressing issues with my website. Key responsibilities include: - Resolving error messages that are currently present on the site - Adding a new function to the website: specifically, facilitating the editing of existing customer information in the database The ideal candidate for this role will have: - Proficient in PHP and MySQL - Prior experience in resolving error messages - Knowledge of and experience with customer database management Please provide your bid, along with your relevant experience, for this project.

Im facing an issue which is difficult to replicate, We have a react native app using mongodb realm. There was an instance where a few records where created and then after pressing home those records vanished. They weren't synced to mongodb and where n...those records vanished. They weren't synced to mongodb and where no longer present in the app. There is no delete functionality in the app. There is a function which checks for online status using netinfo and then when online will re start the sync session with mongodb. There is a frontend indicator which shows the realm connection status and the network connection status. At the time of this error it was reported the indicator which shows realm is connected was flashing both offline and online rapidly which may be the cau...

I'm looking for a skilled Drupal developer to create a complete and fully working custom e-commerce portal with specific features and integrations. Key Requirements: - Product Catalog: The portal should support a product catalog with 100-500 items. - Shopping Cart: A fully functional shopping cart allowing users to add, edit, and remove items. - User Registration: User registration and login system for customers to track their orders and save their details securely. Specific Integrations: - Payment Gateway: Integration of a secure and reliable payment gateway to facilitate online transactions. - Shipping Provider: Integration with a reputable shipping provider to ensure timely and efficient delivery. - Social Media: Incorporation of social media functionalities to enh...

I'm seeking an experienced ASP.NET MVC freelancer to upgrade and enhance the form validation and error handling of my application. The main tasks include: - Retaining attachments: If there are any validation errors, the user must still be able to keep the attached file in the form. To be successful in this project, you need to have a strong understanding of ASP.NET MVC, form validation, and error handling. Your work will improve my application's user experience significantly. Looking forward to your proposals.

I require immediate assistance with a WooCommerce Checkout Page issue. The checkbox on my Checkout page, which is meant to allow users to agree to terms and conditions, is not functioning correctly. When I click on the checkbox, it fails to be checked, despite no error messages or warnings being displayed. Key Requirements: - Fix the issue with the WooCommerce Checkout Page checkbox - Ensure that when the checkbox is clicked, it is checked as intended The task must be done remotely on my PC via AnyDesk. Experience with WordPress and WooCommerce is essential. The freelancer must be proficient in troubleshooting similar issues, and should be able to quickly identify and resolve this specific problem. Your prompt assistance is greatly appreciated.

I'm looking for an experienced Pine Script developer to resolve a syntax error and implement a script that tracks short and long highs/lows with Fibonacci levels in TradingView. The script should: Track the short high using a 100-bar lookback period. Determine the short low from the lowest low after the most recent highest high. Track the long high/low based on the selected date range. Include customizable options for line colors, widths, and visibility. Draw Fibonacci levels between long highs and lows. An error occurs with the if statement, and I need help to fix it and ensure the script works correctly without syntax issues. If you're experienced with TradingView's Pine Script and can resolve this error while maintaining the intended functionality, ...

The project would be to read product data from the magento 2 api, send it to the rocketsource api, process the data and with that processed data save, save it to magento 2 using their api. It would not be all the data, it would be some attributes depending on some specific rules. Extract data of magento (api) -----> Send to Rocketsource (api) ----> Save selected data to magento (api) All in one process.

vb 2012 video and sound recorder. Auto record to file when motion/sound is detected. Auto save file if no motion/sound is detected for 5 seconds. exe File must be compact and small and not dependent on other dll or ocx. Auto detect existing cam and video device on PC. I should be able to compile it on my PC. Note there are a lot of samples on Chat GTP.

I have a Facebook comment bot built in Node.JS that has a slight issue. When it opens up a post, it seems to be prematurely closing and moving to the next profile before it actually writes the comment and likes the post. There are no error messages associated with this behavior. Key Responsibilities: - Diagnosing the bot's current behavior and identifying the root problem causing the premature closure - Modifying the bot's code to ensure it writes the comment and likes the post before moving to the next profile Ideal Skills and Experience: - Proficient in Node.JS - Prior experience working with Facebook APIs and bots - Familiarity with automated social media interactions - Excellent problem-solving and debugging skills, particularly in asynchronous processes Please reac...

I'm looking for a skilled Wordpress developer to address a critical error that is occurring during Loco Translate on my website. Key Requirements: 1. Fixing Critical Error: The primary goal is to improve the website's functionality by resolving the specific critical error that is arising during the Loco Translate process. Key Responsibilities: - You will need to identify the root cause of the critical error and provide a solution that ensures the smooth operation of the Loco Translate functionality. - Additionally, you may need to provide support on SiteOrigin to change a premium date picker into Dutch months. I could do that myself ;-) Communication: - I prefer communication updates via Email, so kindly update me on the progress of the re...

I'm in need of an experienced content editor. Your primary task will be to edit and refine articles for me. Key Responsibilities: - Edit content for grammar, spelling, punctuation, and clarity - Ensure the content is engaging and coherent - Suggest improvements to the style, tone, and structure of the articles This project is focused on a piece with less than 500 words. The ideal candidate should have a keen eye for detail, a thorough understanding of the English language and experience in content editing. Your work should result in a polished, professional piece that's ready for publication.

I am looking for an experienced developer with expertise in both Gmail services and ASP.NET VB.NET. The project involves integrating Gmail with my existing application via an API. Specifically, I need: - Development of API in ASP.NET VB.NET - Integration of the above API with ...VB.NET - Integration of the above API with Gmail - Capability for the integrated system to send Emails To successfully carry out this project, proficient knowledge of ASP.NET VB.NET and familiarity with Gmail services are compulsory. A good understanding of API development and integration is also crucial. The API should be robust, able to handle multiple requests at once, and contain effective error handling processes. Experience in similar projects will greatly increase your chances of being selected fo...

I have a short management paper that I need polished. The job involves: - Grammar and spelling check: I'm looking for a professional to ensure my text is error-free. - Improving flow and readability: I need help ensuring that the paper reads well and is easy to understand. - Ensuring adherence to a specific citation style: I need someone who can ensure the paper follows a specific citation style. Ideal skills include: - Proven experience in academic editing - Strong understanding of various citation styles (e.g. APA, MLA) - Excellent grammar and spelling - Ability to enhance text flow and readability It's a small project but quality is crucial. Please provide samples of your previous work.

vb 2012 video and sound recorder. Auto record to file when motion/sound is detected. Auto save file if no motion/sound detected for 5 seconds. exe File must be compact and small and not dependent on other dll or ocx. Auto detect existing cam and video device on PC. Note there are a lot of samples on Chat GTP.

I need a fast turnaround to correct error messages in my PHP code and database. The main goal of my PHP application is to upload content to the database and ensure the site displays it correctly. Key Responsibilities: - Fixing error messages in PHP code - Addressing database issues - Ensuring smooth content uploading functionality - Ensuring the site can retrieve and display content from the database Ideal Skills and Experience: - Proficient in PHP - Strong understanding of database management - Prior experience in troubleshooting and fixing error messages - Ability to work fast and deliver under tight deadlines.

I have a Wordpress website which I want to add a custom php multistep form to. The multistep form is supposed to get some of it's data from my backend database and also should save the data entered on the form to the database